Bibliografie tematiche / Ions lanthanides

Letteratura scientifica selezionata sul tema "Ions lanthanides"

Autore: Grafiati

Pubblicato: 7 luglio 2024

Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili

Scegli il tipo di fonte:

Consulta la lista di attuali articoli, libri, tesi, atti di convegni e altre fonti scientifiche attinenti al tema "Ions lanthanides".

Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.

Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.

Articoli di riviste sul tema "Ions lanthanides":

Pałasz, A., e P. Czekaj. "Toxicological and cytophysiological aspects of lanthanides action." Acta Biochimica Polonica 47, n. 4 (31 dicembre 2000): 1107–14. http://dx.doi.org/10.18388/abp.2000_3963.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Lanthanides, also called rare-earth elements, are an interesting group of 15 chemically active, mainly trivalent, f-electronic, silvery-white metals. In fact, lanthanides are not as rare as the name implies, except for promethium, a radioactive artificial element not found in nature. The mean concentrations of lanthanides in the earth's crust are comparable to those of life-important elements like iodine, cobalt and selenium. Many lanthanide compounds show particular magnetic, catalytic and optic properties, and that is why their technical applications are so extensive. Numerous industrial sources enable lanthanides to penetrate into the human body and therefore detailed toxicological studies of these metals are necessary. In the liver, gadolinium selectively inhibits secretion by Kupffer cells and it decreases cytochrome P450 activity in hepatocytes, thereby protecting liver cells against toxic products of xenobiotic biotransformation. Praseodymium ion (Pr3+) produces the same protective effect in liver tissue cultures. Cytophysiological effects of lanthanides appear to result from the similarity of their cationic radii to the size of Ca2+ ions. Trivalent lanthanide ions, especially La3+ and Gd3+, block different calcium channels in human and animal cells. Lanthanides can affect numerous enzymes: Dy3+ and La3+ block Ca2+-ATPase and Mg2+-ATPase, while Eu3+ and Tb3+ inhibit calcineurin. In neurons, lanthanide ions regulate the transport and release of synaptic transmitters and block some membrane receptors, e.g. GABA and glutamate receptors. It is likely that lanthanides significantly and uniquely affect biochemical pathways, thus altering physiological processes in the tissues of humans and animals.

Maza-Rodriguez, J., P. Olivera-Pastor, S. Bruque e A. Jimenez-Lopez. "Exchange selectivity of lanthanide ions in montmorillonite". Clay Minerals 27, n. 1 (marzo 1992): 81–89. http://dx.doi.org/10.1180/claymin.1992.027.1.08.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

AbstractThe exchange of Ca2+ and Na+ by tanthanide ions (Ln3+ = Pr3+, Gd3+, Er3+) in montmorillonite was investigated at two different ionic strengths (0·01 and 0·1 mol/kg). Preferential sorption of Ln3+ was observed and variable selectivity coefficients were found depending upon the lanthanide concentration in the solid, and ionic strength. The highest exchange extent of Ln3+ always occurred for the system Na+/Ln3+, but the exchange selectivities of Ln3+ were generally higher in the exchange system Ca2+/Ln3+. Although the relative affinity of montmorillonite for the three lanthanide ions was similar, distinctive behaviour between Pr3+ and the heavier lanthanides, Gd3+ and Er3+, was noted. The study of Ln3+ adsorption in trace amounts showed specific adsorption of lanthanides at high concentrations of Na+ in the external solution and that the exchange stoichiometries in the interlayer regions were 3 : 1 at equilibrium pH = 4.

Alakhras, Fadi. "Kinetic Studies on the Removal of Some Lanthanide Ions from Aqueous Solutions Using Amidoxime-Hydroxamic Acid Polymer". Journal of Analytical Methods in Chemistry 2018 (8 luglio 2018): 1–7. http://dx.doi.org/10.1155/2018/4058503.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Lanthanide metal ions make distinctive and essential contributions to recent global proficiency. Extraction and reuse of these ions is of immense significance especially when the supply is restricted. In light of sorption technology, poly(amidoxime-hydroxamic) acid sorbents are synthesized and utilized for the removal of various lanthanide ions (La3+, Nd3+, Sm3+, Gd3+, and Tb3+) from aqueous solutions. The sorption speed of trivalent lanthanides (Ln3+) depending on the contact period is studied by a batch equilibrium method. The results reveal fast rates of metal ion uptake with highest percentage being achieved after 15–30 min. The interaction of poly(amidoxime-hydroxamic) acid sorbent with Ln3+ ions follows the pseudo-second-order kinetic model with a correlation coefficient R2 extremely high and close to unity. Intraparticle diffusion data provide three linear plots indicating that the sorption process is affected by two or more steps, and the intraparticle diffusion rate constants are raised among reduction of ionic radius of the studied lanthanides.

Citron, Irvin M., Patrick M. Hanlon e Stephen Arthur. "Ultraviolet Spectroscopic Determination of Five Lanthanide Elements without Prior Separation". Applied Spectroscopy 47, n. 6 (giugno 1993): 764–72. http://dx.doi.org/10.1366/0003702934067027.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

This investigation has resulted in an analytical method for the quantitative determination of total lanthanide concentration in aqueous solution by absorbance at 240 nm in the ultraviolet followed by quantitative determination of individual lanthanide ion concentrations by the use of concentration-responsive absorption peaks in the 190–235 nm region. The 240-nm peak is present and is proportional to concentration regardless of the ligand employed to complex the lanthanides (including H2O). The individual lanthanide/ligand peaks in the 190–235 nm region were selected on the basis of their separation from one another, their linearity of absorbance vs. concentration, and their statistical reliability based on replicate sample analyses. Lanthanides involved in this investigation were La+3, Nd+3, Eu+3, Ho+3, and Yb+3. Ligands ultimately selected for complexation were citrate for La+3, Nd+3, and Ho+3, and DTPA for Eu+3, Ho+3, and Yb+3. When large amounts of heavy metal ions were present, a modified method was developed with citrate as the only complexing ligand for all five lanthanides. The method here developed permits the analyses of lanthanide ions in aqueous solution without prior separation and involves the use of comparatively inexpensive instrumentation (UV absorption spectrophotometer).

Werts, Martinus H. V. "Making sense of Lanthanide Luminescence". Science Progress 88, n. 2 (maggio 2005): 101–31. http://dx.doi.org/10.3184/003685005783238435.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

The luminescence of trivalent lanthanide ions has found applications in lighting, lasers, optical telecommunications, medical diagnostics, and various other fields. This introductory review presents the basics of organic and inorganic luminescent materials containing lanthanide ions, their applications, and some recent developments. After a brief history of the discovery, purification and early spectroscopic studies of the lanthanides, the radiative and nonradiative transitions of the 4f electrons in lanthanide ions are discussed. Lanthanide-doped phosphors, glasses and crystals as well as luminescent lanthanide complexes with organic ligands receive attention with respect to their preparation and their applications. Finally, two recent developments in the field of luminescent materials are addressed: near-infrared luminescent lanthanide complexes and lanthanide-doped nanoparticles.

Zhang, Hailong, Ao Li, Kai Li, Zhipeng Wang, Xiaocheng Xu, Yaxing Wang, Matthew V. Sheridan et al. "Ultrafiltration separation of Am(VI)-polyoxometalate from lanthanides". Nature 616, n. 7957 (19 aprile 2023): 482–87. http://dx.doi.org/10.1038/s41586-023-05840-z.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

AbstractPartitioning of americium from lanthanides (Ln) present in used nuclear fuel plays a key role in the sustainable development of nuclear energy1–3. This task is extremely challenging because thermodynamically stable Am(III) and Ln(III) ions have nearly identical ionic radii and coordination chemistry. Oxidization of Am(III) to Am(VI) produces AmO22+ ions distinct with Ln(III) ions, which has the potential to facilitate separations in principle. However, the rapid reduction of Am(VI) back to Am(III) by radiolysis products and organic reagents required for the traditional separation protocols including solvent and solid extractions hampers practical redox-based separations. Herein, we report a nanoscale polyoxometalate (POM) cluster with a vacancy site compatible with the selective coordination of hexavalent actinides (238U, 237Np, 242Pu and 243Am) over trivalent lanthanides in nitric acid media. To our knowledge, this cluster is the most stable Am(VI) species in aqueous media observed so far. Ultrafiltration-based separation of nanoscale Am(VI)-POM clusters from hydrated lanthanide ions by commercially available, fine-pored membranes enables the development of a once-through americium/lanthanide separation strategy that is highly efficient and rapid, does not involve any organic components and requires minimal energy input.

Martín-Rodríguez, R., R. Valiente, F. Aguado e A. C. Perdigón. "Highly efficient photoluminescence from isolated Eu3+ ions embedded in high-charge mica". J. Mater. Chem. C 5, n. 39 (2017): 10360–68. http://dx.doi.org/10.1039/c7tc01818e.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Incorporation of lanthanide ions in synthetic clay minerals is a promising approach to combine the efficient sharp-line emission of lanthanides with the unique structural stability and high adsorption capacity of high-charge micas.

Onghena, Bieke, Eleonora Papagni, Ernesto Rezende Souza, Dipanjan Banerjee, Koen Binnemans e Tom Vander Hoogerstraete. "Speciation of lanthanide ions in the organic phase after extraction from nitrate media by basic extractants". RSC Advances 8, n. 56 (2018): 32044–54. http://dx.doi.org/10.1039/c8ra06712k.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Dhepe, A. S., e A. B. Zade. "Spectrophotometric Study of Ternary Complex Forming Systems of Some Lanthanide Metal Ions with Eriochrome Cyanine R in Presence of Cetylpyridinium Bromide for Microdetermination". E-Journal of Chemistry 8, n. 3 (2011): 1264–74. http://dx.doi.org/10.1155/2011/871685.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Study of coordination compounds of lanthanide elements has received a great attention due to growing applications in science and technology. Number of chromogenic reagents form water soluble colored complexes with lanthanides. Eriochrome cyanine R (ECR) a member of triphenylmethane type of dye has been reported to form green colored complexes with lanthanides and has been used for microdetermination of these metal ions. Addition of cationic surfactant, Cetylpyridinium bromide (CPB), a cationic surfactant sensitizes the color reactions of Gd(III), Tb(III), Dy(III), Ho(III) and Lu(III) with ECR. Formation of water soluble, highly colored ternary complexes with a considerable bathochromic shift of about 50 nm in presence of surfactant has been observed. Optimum reaction conditions and other analytical parameters were also evaluated. Stoichiometric ratio 1:3:3 of Ln: ECR: CPB are responsible for the observed rise in molar absorptivity and sensitivity. Beer’s law was obeyed between 0.50 to 13.00 ppm. Effective photometric range and molar absorptivity of these ternary complexes have been calculated. Effect of some common interfering ions on determination of these lanthanide metal ions was studied. A simple, rapid and highly sensitive spectrophotometeric method has been proposed for the determination of metal ions understudy.

Semenishyn, Nikolay, Serhii Smola, Mariia Rusakova e Natalia Rusakova. "4f-LUMINESCENCE OF LANTHANIDE IONS IN REGIOISOMERIC CORROLE COMPLEXES". Ukrainian Chemistry Journal 87, n. 9 (25 ottobre 2021): 35–44. http://dx.doi.org/10.33609/2708-129x.87.09.2021.35-44.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Isomeric ditopic corroles and complexes of Yb (III), Nd (III) and Er (III) based on them were synthesized and corrole-photosensitized 4f-luminescence in near infrared region was revealed. The structure of isomeric complexes allows adjusting the distance between the corrole core and lanthanide ion. The obtained results show that the sensitization mechanism changes drastically for both different lanthanides and isomeric forms.

Più fonti

Tesi sul tema "Ions lanthanides":

Farkas, Ildiko. "Coordination Chemistry of Actinide and Lanthanide Ions". Doctoral thesis, KTH, Chemistry, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3236.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Mehdoui, Thouraya. "Etude des facteurs favorisant la complexation sélective des ions lanthanides et actinides trivalents". Paris 11, 2005. http://www.theses.fr/2005PA112144.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Afin d'obtenir des informations sur les facteurs qui favorisent la discrimination entre les actinides(III) et les lanthanides(III), nous avons étudié la complexation des composés tris(cyclopentadiényle) du Ce(III) et de l'U(III), (RCp)3M (R = tBu, SiMe3), avec une série d'azines monocycliques possédant des basicités de Lewis et potentiels de réduction différents. La coordination de la pyrazine et des 4,4' et 2,2'-bipyridines sur les complexes (RCp)3M a éte�� également étudiée, afin de mettre en évidence l'oxydation réversible des espèces (RCp)3U par la pyrazine lors de la formation du composé bimétallique de l'uranium(IV) [(RCp)3U]2(pyz). Les groupes cyclopentadiényles tBuCp ne sont pas de simples spectateurs et, par l'effet coopératif de leur coordination, jouent un rôle important dans la différenciation des ions lanthanides et actinides trivalents. La complexation des espèces Cp*2MI par la 2,2'-bipyridine, la phénanthroline et la terpyridine donne les complexes [Cp*2M(L)]I. Pour L = bipy et terpy, ces composés sont réduits en les espèces Cp*2M(L). Les propriétés magnétiques des complexes [Cp*2M(terpy)]I et Cp*2M(terpy) ont confirmé la formulation Cp*2MIII(terpy•–) pour les complexes du Ce(III) et de l'U(III). Un transfert d'électron entre ces espèces a été observé par RMN. Les réactions des complexes [Cp*2M(terpy)]I et Cp*2M(terpy) avec les réactifs H• et H+ montrent une différenciation claire entre ces ions trivalents. Nous avons étudié la coordination du carbène N-hétérocyclique et de molécules d'isonitrile par les espèces (RCp)3M et Cp*2MI ; les réactions de compétition et les structures cristallines des produits montrent une meilleure affinité pour les actinides
In order to obtain clear-cut information on the factors which favour the discrimination between trivalent actinides and lanthanides, we investigated the complexation of the tris(cyclopentadienyl) Ce(III) and U(III) compounds, (RCp)3M (R = tBu, SiMe3), with a series of monocyclic azines with distinct Lewis basicity and reduction potential. Coordination of pyrazine and 4,4' and 2,2'-bipyridines on the (RCp)3M complexes has also been studied. Of major interest is the reversible oxidation of the (RCp)3U species into the uranium(IV) [(RCp)3U]2(pyz) complexes by pyrazine. The presence of cooperativity in the binding of the cyclopentadienyl groups by U(III), due to late appearance of back-bonding, leads to a greater stabilization of the uranium(III) complexes. Complexation of the species Cp*2MI (M = Ce, U) by 2,2'-bipyridine, phenanthroline and terpyridine affords the adducts [Cp*2M(L)]I. For L = bipy and terpy, these compounds are reduced into Cp*2M(L). The magnetic data for [Cp*2M(terpy)]I and Cp*2M(terpy) are consistent with Ce(III) and U(III) species, with the formulation Cp*2MIII(terpy•–). An electron transfer reaction between these species was observed in NMR. Reactions of the [Cp*2M(terpy)]I and Cp*2M(terpy) complexes with H• and H+ donor reagents lead to a clear differentiation of these trivalent ions. We studied the coordination of the stable N-heterocyclic carbene and isonitrile molecules on (RCp)3M and Cp*2MI ; competition reactions and comparison of the crystal structures of the carbene compounds reveal the much better affinity of the NHC and tBuNC ligands for the 5f rather than for the 4f ion

Bretonnière, Yann. "Chimie de coordination des ions lanthanides(III) avec des ligands tripodes azotés et oxygénés". Université Joseph Fourier (Grenoble ; 1971-2015), 2001. http://www.theses.fr/2001GRE10100.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Au cours de ce travail, nous avons pu demontrer les grandes potentialites des ligands tripodes flexibles dans differents domaines d'applications de la chimie des ions lanthanides(iii). Ainsi, dans le cadre des recherches concernant la separation actinides(iii)/lanthanides(iii) par extraction liquide-liquide, nous avons synthetise et etudie le ligand nonadente trenphen. Les complexes 1 : 1 formes avec les ions lanthanides(iii) ont ete caracterises a l'etat solide et en solution. Le ligand trenphen presente de bonnes proprietes en extraction selective des actinides(iii), confirmant l'interet d'utiliser des ligands tripodes pour ameliorer les performances en extraction. Nous nous sommes egalement interesses a la synthese et a l'etude de systemes supramoleculaires polymetalliques. Avec le ligand dodecadente trenterpy, l'incompatibilite entre le nombre de sites donneurs et la coordination voulue par l'ion, et des contraintes steriques importantes entre les bras du ligand, empechent la formation d'un complexe 1 : 1 avec l'ion la 3 + et conduisent a l'auto-assemblage d'un complexe trinucleaire. Dans un autre domaine le complexe de gadolinium(iii) du ligand tpa-acide presente d'excellentes proprietes de relaxivite. Les complexes de lanthanides(iii) avec la tpa-acide ont ete caracterises a l'etat solide. Trois structures differentes sont observees (un tetramere pour la 3 +, un dimere pour pr-yb, et un monomere pour lu 3 +), montrant que le ligand peut accommoder trois nombres de coordination differents (8, 9 et 10) autour d'un ion ln 3 +. La relaxivite elevee du complexe de gadolinium(iii) peut etre attribuee a la presence en solution de deux ou trois molecules d'eau liees au metal, et a une distance gd-h tres courte. Le temps d'echange des molecules d'eau coordonnees est tres rapide avec ce ligand heptadente flexible, ce qui laisse supposer de grandes potentialites des systemes macromoleculaires construits sur ces motifs.

Turcry, Véronique. "Les poly-tétraazamacrocycles : Synthèse via un intermédiaire bis-aminal - Complexation d'ions de métaux de transition et de lanthanides". Brest, 2004. http://www.theses.fr/2004BRES2038.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

La thèse se divise en deux parties : La première est consacrée à la synthèse de composés bis tétraazamacrocycliques, symétriques ou non, via des dérivés bis aminals du cyclam et du cyclen. La méthode est étendue aux tris macrocycles linéaires et cycliques. La deuxième partie étudie les complexes des composés précédents avec les sels des métaux de transition : le cuivre (II) et le nickel (II). Ces complexes sont étudiés par voltammétrie cyclique et par RPE afin de mettre en évidence les éventuelles interactions entre les cations métalliques. Quelques bis-tétraazamacrocycles ont été modifiés par l'adjonction de bras acétate afin de complexer le gadolinium (III). Les composés ainsi obtenus présentent des performances supérieures à celles du DOTA Gd(III) comme agents de contraste en imagerie médicale par résonance magnétique
This work is divided into two parts : The first part is dedicated to synthesis of symmetrical or unsymmetrical bis tetraazamacrocyclic compounds, via bis aminal derivatives of cyclam and cyclen. This method is extended to linear and cyclic tris macrocyclic compounds. In the second part, we report the complexation of these poly tetraazamacrocycles with transition metal ions : Cu(II) and Ni(II). The complexes have been fully investigated by cyclic voltammetry and EPR to determine possible interactions between the metal centres. Carboxylic pendant arms have been grafted on some bis tetraazamacrocycles to coordinate Gd (III). Resulting complexes present better properties that DOTA Gd(III) as nuclear magnetic resonance imaging (MRI) contrast agents

Guillevic, Erwan. "Verres et vitrocéramiques de chalcogénures : nouveau procédé de synthèse et dopage par les ions lanthanides". Rennes 1, 2009. http://www.theses.fr/2009REN1S116.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

D’une part, cette étude a montré que la substitution du sélénium par du soufre dans un système vitreux sans germanium, permet d’améliorer les propriétés optiques et thermiques du verre sans en compromettre la tenue mécanique. De plus, la possibilité de synthétiser de manière reproductible du verre de chalcogénure en système ouvert a été démontrée. D’autre part, sous l’effet d’un traitement thermique, un phénomène de cristallisation en deux étapes a été mis en évidence sur un verre à base de soufre. Les ions erbium, dont l’effet nucléant sur ce verre s’est avéré être supérieur à celui des ions néodyme, peuvent être incorporés dans les phases cristallines, ce qui exacerbe leur luminescence. Il a enfin été démontré que le codopage par des ions ytterbium de vitrocéramiques de sulfures contenant de l’erbium augmente la fluorescence par upconversion de ces derniers
This study has shown that substitution of selenium by sulfur in a germanium-free glass improves its optical properties without decreasing its mechanical strength. It has also been proven that it is possible to synthesize chalcogenide glasses reproducibly in an open system. Structural investigations carried out on a sulfide glass system submitted to a heat treatment indicate a two-step crystallization process. Erbium ions, whose nucleating action on this glass appeared to be stronger than the action of neodymium ions, can be incorporated in the crystalline phases, which leads to stronger light emission peaks in the glass-ceramics compared to the base glass. Adding ytterbium to erbium doped sulfide glass-ceramics increases visible light emission of the erbium ions by upconversion if they are pumped in the near infrared

CHERFA, SAMY. "Etude structurale de la complexation de l'uranyle et des ions lanthanides par des calixarenes fonctionnalises par le cmpo". Paris 11, 1998. http://www.theses.fr/1998PA112346.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Une voie retenue pour reduire le volume des dechets nucleaires consiste a operer une extraction simultanee des actinides et des lanthanides en vue de leur separation ulterieure. Historiquement, les deux premieres familles d'extractants employees pour le retraitement de ces dechets sont les oxydes de phosphine et le cmpo (carbamoyl methyl phosphine oxide). Afin de mieux connaitre le type de complexes formes au cours de l'extraction, nous avons mene des etudes structurales concernant ces deux familles. Elles portaient sur les complexes formes par ces ligands avec l'uranyle d'une part et les lanthanides (iii) sous forme de sels (nitrate) d'autre part. Ces etudes ont ete realisees par diffraction des rayons x sur monocristaux. Plus recemment, une nouvelle famille de molecules extractantes des lanthanides (iii) et actinides (iii) a ete developpee. Il a ete montre qu'en fonctionnalisant un macrocycle organique de type calixarene (oligomere cyclique resultant de la polycondensation d'unites phenoliques) par un ligand de type cmpo, le pouvoir extractant de ces molecules, en termes de rendement et de selectivite vis-a-vis des lanthanides les plus legers, etait bien superieur a celui du cmpo seul. Notre etude, realisee par diffraction des rayons x sur monocristaux des complexes formes entre ces ligands calix4arenes-cmpo (a quatre unites phenoliques) avec l'uranyle et des nitrates de lanthanides (iii), a permis de definir le type de complexes formes, c'est a dire d'en etablir la stchiometrie et le mode de coordination (monodente ou bidente) des fonctions cmpo. Ces differentes etapes de caracterisation nous ont permis de determiner les correlations existant entre d'une part les structures des complexes et d'autre part la selectivite et l'exacerbation du pouvoir extractant mesurees en phase liquide.

Rétot, Hélène. "Elaboration de céramiques transparentes d'oxydes mixtes dopés par des ions lanthanides et caractérisation de leurs propriétés de scintillation". Paris 6, 2009. http://www.theses.fr/2009PA066217.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Ce travail de thèse porte sur le développement de céramiques transparentes présentant des propriétés de scintillation. Deux familles de composés (dopées par des ions lanthanides) sont étudiées : les sesquioxydes de terres rares et les hafnates de terres rares. Ces matériaux sont synthétisés sous forme de poudres (par combustion ou coprécipitation) puis frittés pour obtenir des céramiques transparentes (par frittage flash (Spark Plasma Sintering) ou frittage en deux étapes (frittage naturel + Hot Isostatic Pressing)). Le positionnement des niveaux d’énergie des dopants lanthanides dans des matrices comme Lu2O3 permet d’expliquer l’absence de la luminescence rapide 5d  4f dans ces matériaux. Les sesquioxydes cubiques dopés à l’europium apparaissent très intéressants en raison de leur rendement lumineux très élevé ; des codopants sont proposés pour réduire leur afterglow. Les pyrohafnates dopés praséodyme, europium ou titane émergent aussi comme des matériaux prometteurs

Vallerini, Barbosa Itália. "Nanocristaux oxydes luminescents pour le développement de nanosondes de température in vivo". Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALI125.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Les changements thermiques biologiques sont des événements courants lors d'activités métaboliques cellulaires anormales. En effet, les aberrations thermiques – telles qu'une augmentation de la température locale des tissus – sont directement liées à la détection de zones enflammées, à la présence de tumeurs ou d'autres maladies. En plus de contribuer au diagnostic des maladies, la détermination de la température locale dans les systèmes biologiques peut également aider à leur traitement. Par exemple, dans l'hyperthermie, une élévation de température doit être induite dans les tissus tumoraux à des niveaux cytotoxiques afin de détruire les cellules cancéreuses et de fournir un traitement contre le cancer. Cependant, la montée en température doit être réalisée de manière contrôlée et bien localisée sur les cellules cibles cancéreuses, tout en évitant un échauffement des tissus sains environnants. De plus, pour déterminer de telles maladies, les variations de température doivent être déterminées avec précision. Des études antérieures en nanothermométrie luminescente montrent qu’il n’y a encore de sondes thermiques adéquates pour les environnements biologiques. Il est donc nécessaire de développer des nanothermomètres luminescents avec une morphologie et une taille adéquate, fonctionnant avec des longueurs d'onde d'excitation et d'émission dans le domaine de transparence des tissus. Pour répondre à cette demande, nous avons mené une étude de différents nanocristaux d'oxydes dopés avec des ions lanthanides afin de développer des nanothermomètres luminescents capables de déterminer la température dans des systèmes in vivo à haute résolution thermique. Les performances thermométriques ont été déterminées en calculant la sensibilité thermique relative (S_r) à l'aide de l'approche d'intensité de luminescence ratiométrique. Par ailleurs, notre étude a permis de soulever quelques hypothèses pouvant contribuer efficacement aux performances thermométriques. Nous avons mis en jeu la technique du rapport d’intensité de deux pics de luminescence pour laquelle les valeurs de S_r peuvent être optimisées en co-dopant les nanocristaux avec deux, ou plusieurs, ions Ln3+ et en utilisant des matrices oxydes présentant différentes énergies de phonons. Ainsi, du fait de sa nature générique et de sa souplesse de synthèse, la méthode Pechini a été choisie pour synthétiser plusieurs matrices oxydes, Y2O3, Y2Ge2O7, Y3Al5O12 (YAG), Y3BO6 et YBO3. Les nanocristaux ont tout d’abord été mono-dopés avec Nd3+, puis co-dopés avec Nd3+ -Yb3+ pour améliorer les propriétés de sonde thermiques dans les fenêtres biologiques du proche IR. De plus, nous avons optimisé les concentrations de dopage dans les matrices hôtes pour une plus grande efficacité dans la détection de la luminescence dans les organismes biologiques. Nous avons observé expérimentalement que les valeurs de Sr sont fortement impactées sur l'énergie des phonons de la matrice. Nous avons observé que par co-dopage Nd3+-Yb3+ les performances thermométriques des nanocristaux sont améliorées par rapport aux nanocristaux mono dopés Nd3+. Notre étude de ce différent oxyde a montré que le YAG et Y2O3 sont des matrices les plus prometteuses, pour l'application de la nanothermométrie luminescente in vivo. Enfin, des nanocristaux individuels (non agglomérés comme dans le cas des synthèses Péchini) de YAG de taille 60 nm et de morphologie contrôlée ont été obtenus en solution par la méthode solvothermale pour faire avancer les études dans les futures applications biologiques. Nous avons observé que les nanothermomètres YAG adaptés à cet objectif ont un Sr égal à 0,47 %·K-1 et une résolution thermique de 0,3 K. Des tests expérimentaux in vivo seront bien sûr nécessaires pour valider les résultats de cette étude; cependant, nos résultats obtenus sur les performances des nanocristaux YAG:Nd3+-Yb3+ démontrent dès à présent un fort potentiel pour des applications in vivo de nanothermométrie luminescente ratiométrique
Biological thermal modifications are common events during abnormal cellular metabolic activities. Indeed, thermal aberrations – such as an increase in local tissue temperature – are directly related to the detection of inflamed areas, the presence of tumors, or other diseases. In addition to contributing to the diagnosis of diseases, the determination of local temperature in biological systems can also help with their treatment. For instance, in hyperthermia, the increase in temperature must be induced in tumor tissues up to cytotoxic levels in order to kill cancer cells and therefore, it assists in the cancer treatment. However, the increase in temperature must be carried out in a controlled and well-localized manner to target cancer cells, while avoiding overheating of surrounding healthy tissue. Furthermore, to determine such biological aberrations, temperature variations must be accurately determined. The thermometric performance of the nanothermometers was determined by calculating the relative thermal sensitivity (S_r) using the ratiometric luminescence intensity approach. Furthermore, our study made it possible to raise some hypotheses that can effectively contribute to the thermometric performance of thermal probes. We use the technique of the intensity ratio of two luminescence peaks for which the values of S_r can be optimized by co-doping the nanocrystals with two, or more, Ln3+ ions and by using oxide matrices presenting different phonon energies. Thus, due to its generic nature and synthesis flexibility, the Pechini method was chosen to synthesize several oxide matrices, Y2O3, Y2Ge2O7, Y3Al5O12 (YAG), Y3BO6 and YBO3. The nanocrystals were firstly monodoped with Nd3+ and posteriorly, codoped with Nd3+ -Yb3+ to improve the thermal probe properties within the biological windows of near infrared. In addition, we optimized the doping concentrations in the host matrices for greater efficiency in luminescence detection in biological organisms. We experimentally observed that Sr values are strongly impacted to the phonon energy of the matrix. We analyzed that by Nd3+ -Yb3+ codoping the thermometric performance of nanocrystals is improved compared to nanocrystals mono doped with Nd3+. Our study of different oxides shows that the YAG and Y2O3 matrices are the most promising matrices for the luminescence nanothermometry in vivo application. Lastly, YAG individual nanocrystals (non-agglomerated as in the case of Pechini syntheses) of size 60 nm and controlled morphology were obtained in solution by the solvothermal method to advance in further studies in biological applications. We observed that the YAG nanothermometers suitable for the purpose have a S_r equal to 0.47 %·K-1 and a thermal resolution of 0.3 K. In vivo experimental tests are required to validate the findings of this study; however, our results obtained on the performance of YAG: Nd3+ -Yb3+ nanocrystals has been showing high potential for in vivo applications of ratiometric luminescence nanothermometry

Lan, Haichao. "Synthèse, croissance cristalline et propriétés optiques de matériaux oxydes dopés avec les ions Dy3+/Tb3+ - Ce3+/ Eu3+/Yb3+ pour une émission laser dans le visible". Electronic Thesis or Diss., Université Paris sciences et lettres, 2022. http://www.theses.fr/2022UPSLC009.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Les sources cohérentes compactes et économiques émettant dans le domaine jaune - verte (500 ~ 600 nm) sont d'un grand intérêt dans les domaines de l'affichage optique, de la médecine et de la biologie. Actuellement, les méthodes pour générer des lasers visibles comprennent la diode laser, la conversion de fréquence non linéaire à partir d’un laser infrarouge ou le pompage direct du milieu de gain dopé avec des ions luminescents (Pr3+, Sm3+, Tb3+, etc.). En général, les ions Dy3+ et Tb3+ ont d'excellentes propriétés de luminescence, mais leurs faibles sections efficaces d'absorption demeure est le plus grand obstacle à leur application et à leur développement.Ce travail de thèse visait à l'étude de nouveaux cristaux laser visibles à base des cristaux oxydes dopés avec des ions Dy3+ ou Tb3+, en introduisant les Ce3+, Eu3+ ou Yb3+ comme ions sensibilisateurs pour améliorer les propriétés de luminescence. Différentes compositions de co-dopage incluant la sélection de l’ion sensibilisateur et l'optimisation de la concentration de dopage ont été mises en œuvre. Parallèlement, divers matrices hôtes oxydes telles que le CaYAlO4, le CaYAl3O7, le Lu3Al3Ga2O12, le Ca3Sc2Si3O12, le Y3Sc2Al3O12 et le YAlO3 ont été sélectionnés et d’abord étudiés sous forme polycristalline puis élaborées sous forme de monocristaux par la méthode Czochralski. Les propriétés de spectroscopie optique d’absorption, d'émission, de durée de vie de la fluorescence et de transfert d'énergie, ont été évaluées
The compact and cost-effective coherent source emitting in yellow and green region (500 ~ 600 nm) is of great interest in the fields of optical display, medicine and biology. Presently, the pervasive methods for generating visible lasers include laser diode (LD), nonlinear frequency conversion, and direct pumping of the gain medium doped with luminescent ions (Pr3+, Sm3+, Tb3+, etc.). In general, Dy3+ as well as Tb3+ have excellent luminescence properties, but the extremely small absorption cross-section is the biggest obstacle to their application and development.This PhD work was aimed at the investigation of novel visible laser crystals on the basis of the Dy3+ or Tb3+ doped oxide crystals, by introducing Ce3+, Eu3+ or Yb3+ as sensitizer ions for enhancing the luminescence properties. Different co-doping proposals including the sensitizer selection and the doping concentration optimization were implemented. In the meantime, various oxide hosts such as CaYAlO4, CaYAl3O7, Lu3Al3Ga2O12, Ca3Sc2Si3O12, Y3Sc2Al3O12 and YAlO3 were selected and synthesized and the co-doped laser crystals based on the above hosts were grown by the Czochralski method. The corresponding optical spectroscopy properties including the absorption, emission, fluorescence lifetime and energy transfer were comprehensively evaluated

Nicodème, Franck. "Etude de complexes à nucléarite limitée renfermant simultanément des lanthanides identiques où différents : nouveaux inhibiteurs de l'anhydrase carbonique". Toulouse 3, 2002. http://www.theses.fr/2002TOU30026.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Più fonti

Libri sul tema "Ions lanthanides":

Astrid, Sigel, e Sigel Helmut, a cura di. The lanthanides and their interrelations with biosystems. New York: Marcel Dekker, 2003.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Walsh, Brian M. Spectroscopy and excitation dynamics of the trivalent lanthanides Tm²⁺ and Ho³⁺ in LiYF₄. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1995.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Wybourne, Brian G. Optical spectroscopy of lanthanides: Magnetic and hyperfine interactions. Boca Raton, FL: CRC Press, 2008.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Azarraga, L. V. Lanthanide ion probe spectroscopy for metal ion speciation. Athens, GA: U.S. Environmental Protection Agency, Environmental Research Laboratory, [1990], 1990.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

de Bettencourt-Dias, Ana, a cura di. Luminescence of Lanthanide Ions in Coordination Compounds and Nanomaterials. Chichester, United Kingdom: John Wiley & Sons Ltd, 2014. http://dx.doi.org/10.1002/9781118682760.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Bettencourt-Dias, Ana de. Luminescence of lanthanide ions in coordination compounds and nanomaterials. Chichester, West Sussex, United Kingdom: Wiley, 2014.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Geraldes, Carlos F. G. C. Lanthanide and Other Transition Metal Ion Complexes and Nanoparticles in Magnetic Resonance Imaging. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003374688.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Wybourne, Brian G., e Lidia Smentek. Optical Spectroscopy of Lanthanides. Taylor & Francis Group, 2019.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

(Editor), Helmut Sigel, e Astrid Sigel (Editor), a cura di. Metal Ions in Biological Systems: Volume 40: The Lanthanides and Their Interrelations with Biosystems (Metal Ions in Biological Systems). CRC, 2003.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Sigel, Helmut. Metal Ions in Biological Systems : Volume 40: The Lanthanides and Their Interrelations with Biosystems. Taylor & Francis Group, 2003.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Più fonti

Capitoli di libri sul tema "Ions lanthanides":

Faulkner, Stephen, e Manuel Tropiano. "Heterometallic Complexes Containing Lanthanides". In Luminescence of Lanthanide Ions in Coordination Compounds and Nanomaterials, 331–58. Chichester, United Kingdom: John Wiley & Sons Ltd, 2014. http://dx.doi.org/10.1002/9781118682760.ch09.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Furmann, B., G. Szawiola, A. Jarosz, A. Krzykowski, D. Stefanska e J. Dembczynski. "Techniques of laser spectroscopy in investigations of lanthanides’ free atoms and ions". In Laser 2009, 61–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-12286-6_7.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Bünzli, Jean-Claude G., e Jack MacB Harrowfield. "Lanthanide Ions and Calixarenes". In Calixarenes: A Versatile Class of Macrocyclic Compounds, 211–31. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-009-2013-2_9.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Guru, Sruthi, e Indu Tucker Sidhwani. "Lanthanide Metal Ions Detection". In Functional Fluorescent Materials, 58–92. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003352372-4.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Chen, Xueyuan, Yongsheng Liu e Datao Tu. "A General Introduction to Lanthanide Ions". In Lanthanide-Doped Luminescent Nanomaterials, 1–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40364-4_1.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Hasegawa, Miki, e Yasuchika Hasegawa. "Triboluminescence of Lanthanide Complexes". In The Materials Research Society Series, 105–30. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-0260-6_7.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

AbstractThe photoluminescence of lanthanide complexes originating from f–f transitions is generally sensitized through energy transfer from the ligand to the lanthanide ion in the excited state under UV irradiation. This phenomenon is known as the photo-antenna effect. Luminescence driven by mechanical stimuli, such as tapping or rubbing, is called mechanoluminescence or triboluminescence (TL). In recent years, reports on TL in rare-earth complexes, which have attracted attention as novel luminescent materials that do not require an electrical excitation source, have steadily increased. In this chapter, we focus on triboluminescent lanthanide complexes. Specifically, we introduce the history and detection methods of TL and cite recent examples of materials demonstrating this phenomenon, particularly coordination polymer-like and discrete molecular crystalline lanthanide complexes. Finally, we summarize the application prospects of these complexes as soft crystals.

Rodriguez-Ubis, Juan C., Ernesto Brunet e Olga Juanes. "Lanthanide Ions as Luminescent Probes". In Encyclopedia of Metalloproteins, 1077–87. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-1533-6_162.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Werts, Martinus H. V. "Near-Infrared Luminescent Labels and Probes Based on Lanthanide Ions and Their Potential for Applications in Bioanalytical Detection and Imaging". In Lanthanide Luminescence, 133–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/4243_2010_9.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Chen, Xueyuan, Yongsheng Liu e Datao Tu. "Size Effect on the Luminescence of Lanthanide Ions in Nanoparticles". In Lanthanide-Doped Luminescent Nanomaterials, 17–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40364-4_2.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Bünzli, Jean-Claude G. "Luminescence Bioimaging with Lanthanide Complexes". In Luminescence of Lanthanide Ions in Coordination Compounds and Nanomaterials, 125–96. Chichester, United Kingdom: John Wiley & Sons Ltd, 2014. http://dx.doi.org/10.1002/9781118682760.ch04.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Atti di convegni sul tema "Ions lanthanides":

Rutt, Harvey. "Optical properties of lanthanides ions in low vibrational frequency solvents". In 18th International Conference on Infrared and Millimeter Waves. SPIE, 1993. http://dx.doi.org/10.1117/12.2298517.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Mirkarimov, D., e T. Radjabov. "Optical proprieties of the silica glasses doped by ions of some lanthanides". In 2006 2nd IEEE/IFIP International Conference in Central Asia on Internet. IEEE, 2006. http://dx.doi.org/10.1109/canet.2006.279267.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Carrasco, Irene, Laetitia Laversenne, Stefano Bigotta, Alessandra Toncelli, Mauro Tonelli, Alexander I. Zagumennyi e Markus Pollnau. "Super-Quadratic Upconversion Luminescence among Lanthanide Ions". In 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). IEEE, 2019. http://dx.doi.org/10.1109/cleoe-eqec.2019.8872394.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Chen, Chaohao, Baolei Liu, Jiayan Liao, Lei Ding, Xuchen Shan e Fan Wang. "Lanthanide ions in nanocrystals for biophotonics application". In 2021 International Conference on Optical Instruments and Technology: Optical Systems, Optoelectronic Instruments, Novel Display and Imaging Technology, a cura di Juan Liu, Baohua Jia, Xincheng Yao, Yongtian Wang, Liangcai Cao e Takanori Nomura. SPIE, 2022. http://dx.doi.org/10.1117/12.2618300.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

van Eijk, C. W. "Fast lanthanide-doped inorganic scintillators". In Tenth Feofilov Symposium on Spectroscopy of Crystals Activated by Rare Earth and Transitional Ions, a cura di Alexander I. Ryskin e V. F. Masterov. SPIE, 1996. http://dx.doi.org/10.1117/12.229141.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Pugina, Roberta S., Eloísa G. Hilário, Manoel L. da Silva-Neto, Anderson S. L. Gomes e José Maurício A. Caiut. "Microparticles obtained via spray pyrolysis for random laser and luminescence thermometry applications". In Latin America Optics and Photonics Conference. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/laop.2022.w1a.5.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

YAG (Yttrium Aluminum Garnet) spheres doped with different lanthanide ions were obtained via Spray Pyrolysis. The Nd3+:YAG particles were studied for their stimulated emissions in disordered environments, while Yb3+/Er3+:YAG were intended for studies at different temperatures.

Mao, Cong, Hongji Sang, Jiawei Zheng e Yan Wu. "Study on Synthesis of the Organophosphorus Functionalized MCM-41 And its Adsorption Property for Dy(III)". In 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-93196.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

Abstract The composite of organophosphorus groups loaded on MCM-41(MCM-Zr-TBP) was prepared by multi-steps impregnation method to develop a novel adsorbent for radioactive lanthanides extraction from the secondary contaminated water. The synthesized hybrid material was characterized by SEM and TG. Dy(III) was taken as the representative of trivalent lanthanides. The adsorption performance of Dy(III) on MCM-Zr-TBP composite was systematically studied as the functions of solution pH, initial concentration, interaction time and aqueous temperature. The results showed that Dy(III) adsorption on MCM-Zr-TBP composite was highly dependent on aqueous pH and initial metal ion concentration. Compared with the Freundlich and pseudo-first order models, the Langmuir and pseudo-second order models presented better fitting for the adsorption data. These results indicated that MCM-Zr-TBP was found to be an effective and competent adsorbent, which could be used for the effective removal of lanthanides from the wastewater.

Nuñez, Vicente, Brent Millare, Sanghoon Shin, Srigokul Upadhyayula, Sharad Gupta, Jacob M. Vasquez e Valentine Vullev. "Print-and-Peel Microfabrication for Space-Domain Time-Resolved Emission Measurements on a Chip". In ASME 2010 5th Frontiers in Biomedical Devices Conference. American Society of Mechanical Engineers, 2010. http://dx.doi.org/10.1115/biomed2010-32073.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

We describe the development of devices that utilize the dynamics of laminar microflows for time-resolved emission measurements with steady-state excitation and detection used solely in DC modes of operation. Our current setup allows for measurements of emission lifetimes as short as tens of microseconds. We demonstrated the function of the devices on determining the lifetimes of chelates of lanthanide (III) ions.

Young, J. P., D. L. Donohue e D. H. Smith. "Application of resonance ionization mass spectrometry: survey of the lanthanide elements in the region 430-455-nm". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.tha5.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Abstract (sommario):

A study of the application of resonance ionization mass spectrometry (RIMS) to the lanthanide elements, except promethium, has been initiated. The spectral range for this investigation has been generally 430-455 nm. The lanthanide atoms are generated at a thermal source and are excited and ionized by a single- or two-color process using a N2-pumped laser and/or one or two dye lasers of broad bandwidth, 1 cm–1. The purpose of the survey is severalfold: to evaluate analytically useful RIMS transitions, to gain further understanding of possible resonant optical mechanisms that can generate ions, and to gain experience in spectral interpretation that can be applied to a broad study of the heavier actinides. Several types of optical process have been identified. Many of the RIMS transitions can be assigned to single-color, resonant, two- or three-photon transitions. Other optical mechanisms for generating ions are also observed, however, such as two-photon processes to a bound state, two-photon transitions to an autoionizing level, etc. At least some of the transitions seen in europium and previously assigned to a possible hybrid resonant effect are due to two-photon transitions to apparently new levels. The implications of these results to RIMS are discussed.

Kumari, Puja, e Sourav Das. "Spectroscopic behavior of lanthanide ions in near UV excited material". In 3RD INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC-2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0001291.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Rapporti di organizzazioni sul tema "Ions lanthanides":

Granger, Trinity D., Victoria A. Henry e Stanley Latesky. Separation of Lanthanide Ions with Kl?ui Ligand Resin. Office of Scientific and Technical Information (OSTI), luglio 2007. http://dx.doi.org/10.2172/1029442.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Hobbs, D. T., T. C. Shehee e A. Clearfield. Experimental Findings On Minor Actinide And Lanthanide Separations Using Ion Exchange. Office of Scientific and Technical Information (OSTI), settembre 2013. http://dx.doi.org/10.2172/1093854.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Hobbs, D., e T. Shehee. EXPERIMENTAL FINDINGS ON MINOR ACTINIDE AND LANTHANIDE SEPARATIONS USING ION EXCHANGE. Office of Scientific and Technical Information (OSTI), settembre 2014. http://dx.doi.org/10.2172/1157060.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Bromm, A. J. Jr, L. M. Vallarino, R. C. Leif e J. R. Quagliano. The addition of a second lanthanide ion to increase the luminescence of europium(III) macrocyclic complexes. Office of Scientific and Technical Information (OSTI), dicembre 1998. http://dx.doi.org/10.2172/314151.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri