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Littérature scientifique sur le sujet « Inhomogeneous spectral line broadening »

Auteur : Grafiati
Publié le 21 décembre 2024

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Articles de revues sur le sujet "Inhomogeneous spectral line broadening"

1

Igo, A. V. « Inhomogeneous size broadening of the Raman scattering spectral line in nanocrystals ». Optics and Spectroscopy 120, no 4 (avril 2016) : 529–33. http://dx.doi.org/10.1134/s0030400x16040093.

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Parker, J. C., et R. W. Siegel. « Raman microprobe study of nanophase TiO2 and oxidation-induced spectral changes ». Journal of Materials Research 5, no 6 (juin 1990) : 1246–52. http://dx.doi.org/10.1557/jmr.1990.1246.

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A Raman microprobe study of as-compacted nanophase TiO2 was carried out to investigate the spatial inhomogeneity of its anatase and rutile phases. Also, changes in the observed Raman spectra (line shifts and broadening) were investigated as a function of annealing at temperatures up to 600°C in argon or air. Microscopic phase inhomogeneity is observed and Raman spectral changes are shown to result from inhomogeneous oxygen deficiency in the nanophase TiO2. The line positions corresponding to the Raman active Eg modes in both anatase and rutile are found to be sensitive to this oxygen deficiency and are potential quantitative indicators of such deviations from stoichiometry.
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Maniloff, Eric S., Alan E. Johnson et Thomas W. Mossberg. « Spectral Data Storage Using Rare-Earth-Doped Crystals ». MRS Bulletin 24, no 9 (septembre 1999) : 46–50. http://dx.doi.org/10.1557/s0883769400053069.

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Conventional optical data-storage techniques, such as magneto-optic disks and CD-ROMs, record a single bit of information at each particular substrate location. In order to produce the gigabyte-class storage substrates demanded by today's computers using such conventional technologies, access to tens of billions of individual material locations is required. This brute-force approach to optical data storage has produced impressive results. However, there is increasing interest in methods for more efficiently accessing storage materials. One approach is to record multiple bits at a single storage-material location. This can be accomplished by multiplexing the bits spectrally, using differing optical frequencies to record data bits. It has been realized for over 20 years that when certain materials are cooled to appropriate temperatures, typically below 20 K, the possibility of spectrally multiplexing large numbers of bits in a single material location arises. Although this approach, known as spectral hole-burning, has been proposed as a data-storage mechanism, to date it has primarily been used as a tool to study material properties. Rare-earth-doped crystals have been demonstrated to have properties that lend themselves to a variety of different spectral hole-burning-based data-storage applications. In this article, we will review the principles of spectral hole-burning, discuss some specific material systems in which spectral hole-burning is of particular interest, and describe methods for producing high-capacity, high-data-rate spectral memories.Spectral hole-burning, and spectral memories based on spectral hole-burning, depend on a material property referred to as inhomogeneous absorption line broadening. Materials exhibiting this property contain active atoms or molecules that individually respond to (absorb) very specific frequencies of light, but the collective response of all of the material's active atoms or molecules covers a spectral region that is broad compared with the response of a particular active atom or molecule. Inhomogeneous absorption line broadening is caused by local variations in the structure of the host, which in turn lead to variations in the electronic levels of the active atoms or molecules. The absorption linewidth of an individual absorber is referred to as the homogeneous linewidth Γh, and the absorption width of a collection of inhomogeneously broadened absorption centers is referred to as the inhomogeneous linewidth Γi. Application of monochromatic light to such a material has the effect of exciting only a very small subset of active absorbing atoms—those residing in the illuminated spatial volume within a homogeneous width of the exciting light's specific frequency. If the frequency of the imposed light is shifted, a different subset of active absorbing atoms in the illuminated volume responds.
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Normani, Simone, Pavel Loiko, Roman Maksimov, Vladislav Shitov, Vladimir Osipov, Alain Braud et Patrice Camy. « Inhomogeneous spectral line broadening and site distribution in “mixed” Er:(Sc,Y)2O3 laser ceramics ». EPJ Web of Conferences 309 (2024) : 06009. http://dx.doi.org/10.1051/epjconf/202430906009.

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Erbium-doped “mixed” yttria-scandia (ScxY1-x)2O3 transparent laser ceramics were fabricated by vacuum sintering at 1750 °C from laser-ablated nanoparticles. Their absorption and mid-infrared emission properties were studied. The addition of Sc3+ induces a strong inhomogeneous spectral line broadening, modifies the crystal field and affects the distribution of Er3+ ions over C2 and C3i symmetry sites. Due to their broadband emission properties, Er:(ScxY1-x)2O3 ceramics are appealing for 2.8-μm lasers.
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Laman, N., S. Sree Harsha et D. Grischkowsky. « Narrow-Line Waveguide Terahertz Time-Domain Spectroscopy of Aspirin and Aspirin Precursors ». Applied Spectroscopy 62, no 3 (mars 2008) : 319–26. http://dx.doi.org/10.1366/000370208783759768.

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Low frequency vibrational modes of pharmaceutical molecules are dependent on the molecule as a whole and can be used for identification purposes. However, conventional Fourier transform far-infrared spectroscopy (FT-IR) and terahertz time-domain spectroscopy (THz-TDS) often result in broad, overlapping features that are difficult to distinguish. The technique of waveguide THz-TDS has been recently developed, resulting in sharper spectral features. Waveguide THz-TDS consists of forming an ordered polycrystalline film on a metal plate and incorporating that plate in a parallel-plate waveguide, where the film is probed by THz radiation. The planar order of the film on the metal surface strongly reduces the inhomogeneous broadening, while cooling the waveguide to 77 K reduces the homogeneous broadening. This combination results in sharper absorption lines associated with the vibrational modes of the molecule. Here, this technique has been demonstrated with aspirin and its precursors, benzoic acid and salicylic acid, as well as the salicylic acid isomers 3- and 4-hydroxybenzoic acid. Linewidths as narrow as 20 GHz have been observed, rivaling single crystal measurements.
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Dragounová, Kateřina, Zdeněk Potůček, Štěpán Potocký, Zdeněk Bryknar et Alexander Kromka. « Determination of temperature dependent parameters of zero-phonon line in photo-luminescence spectrum of silicon-vacancy centre in CVD diamond thin films ». Journal of Electrical Engineering 68, no 1 (1 janvier 2017) : 74–78. http://dx.doi.org/10.1515/jee-2017-0010.

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Abstract In this work we present a methodological approach to the temperature dependence of photoluminescence (PL) emission spectra of the silicon-vacancy centre in diamond thin films prepared by chemical vapour deposition. The PL spectra were measured in the temperature range of 11 - 300 K and used to determine the temperature dependence of the zero-phononline full-width at half-maximum and of the peak position. Experimental data were fitted by models of lattice contraction, quadratic electron-phonon coupling, homogeneous and inhomogeneous broadening. We found that the shift of peak position and peak broadening reflect polynomial dependence on temperature. Moreover, a proper setting of monochromator slits width is discussed with respect to line profile broadening.
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Astakhov, G. V., V. P. Kochereshko, V. A. Kosobukin, D. R. Yakovlev, T. Wojtowicz, G. Karczewski, J. Kossut, W. Ossau et G. Landwehr. « Model Study of Inhomogeneous Line Broadening in Excitonic Spectra of Quantum Wells ». Acta Physica Polonica A 94, no 2 (août 1998) : 235–39. http://dx.doi.org/10.12693/aphyspola.94.235.

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Liu, G. K., Jin Huang et James V. Beitz. « Microscopic nature of inhomogeneous line broadening : Analysis of the excitation-line-narrowing spectra ofCf4+inCeF4 ». Physical Review B 48, no 18 (1 novembre 1993) : 13351–60. http://dx.doi.org/10.1103/physrevb.48.13351.

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Кочаровская, Е. Р., А. В. Мишин, И. С. Рябинин et В. В. Кочаровский. « Особенности одновременной генерации низко- и высокодобротных мод в гетеролазерах на квантовых точках с большим временем некогерентной релаксации оптических дипольных колебаний ». Физика и техника полупроводников 53, no 10 (2019) : 1329. http://dx.doi.org/10.21883/ftp.2019.10.48285.31.

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We investigate the features of multimode steady-state generation of the superradiant heterolasers which have an active medium formed by the quantum dots with long incoherent relaxation time and a cavity of a combined Fabry-Perot type with a distributed feedback of the counter-propagating waves. We show that a quantum-coherent dynamics of the optical dipole oscillations and a population inversion of the working levels in an ensemble of the quantum dots with a strong inhomogeneous broadening of a spectral line may lead to a simultaneous lasing of modes with a various degree of phasing and/or correlation and with qualitatively different dynamical behavior, including quasi-stationary, metastable, self-modulated, pulsed-periodic, quasi-chaotic ones.
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Wei, Zhiliang, Jian Yang, Youhe Chen, Yanqin Lin et Zhong Chen. « Line broadening interference for high-resolution nuclear magnetic resonance spectra under inhomogeneous magnetic fields ». Journal of Chemical Physics 142, no 13 (7 avril 2015) : 134202. http://dx.doi.org/10.1063/1.4916520.

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Thèses sur le sujet "Inhomogeneous spectral line broadening"

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Hultquist, Adam. « Spectral line broadening using ABO theory ». Thesis, Uppsala universitet, Teoretisk astrofysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-377225.

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Faid, Karim. « Stochastic theory of relaxation and collisional broadening of spectral line shapes ». Diss., Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/13512.

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A complete stochastic theory of relaxation is developed in terms of a homogeneous equation for the averaged density matrix of a system immersed in a thermal bath. This theory is then used as the basis of a new stochastic approach to the phenomenon of collisional broadening of spectral line shapes. Single photon and multiphoton processes are studied. The features of a line shape are linked by simple expressions to the statistical properties of a stochastic hermitian Hamiltonian. The ordinary line shape predicted by Kubo's approach is generalized. The present approach predicts broadening as well as asymmetry and shift. A representation of line shapes in multiphoton processes by diagrams is also developed.
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Bengtsson, Kristoffer. « Broadening of spectral lines in the Gaia-ESO survey ». Thesis, Uppsala universitet, Teoretisk fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-355195.

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Analyzing stellar spectra plays a big role in understanding the evolution of our galaxy. Having good data for spectral line properties is very important when analyzing these spectra. One part of the Gaia-ESO public spectroscopic survey (GES) is to gather data for spectral line properties from stellar spectra. The scope of this project is to study one of these properties, the spectral line width caused by collisional broadening by hydrogen. Collisional broadening by hydrogen occurs when a hydrogen atom collides with a particle. The goal of this project is to successfully calculate the collisional spectral line broadening of iron lines where new data is missing from the GES using modern quantum mechanical calculations. These calculations are done using the ABO theory, which is more advanced than previously established theory.A table of Fe-I (Neutral iron) spectral lines without collisional broadening data in the GES has been provided. Using the ABO theory and the accompanying ABO cross section calculator code, estimates of collisional broadening by hydrogen have been calculated for these lines. The new calculations predict that the line width of the spectral lines are typically twice as large compared to older estimates calculated using simpler theory. This new data can be expected to improve stellar spectrum analysis in the Gaia-ESO survey spectra.
Analys av stjärnspektran spelar en stor roll i vår förståelse av vintergatans utveckling. Att ha bra data för spektrallinjers egenskaper är oerhört viktigt vid analys av dessa spektran. En del i Gaia-ESO public spectroscopic survey (GES) är att samla in data för dessa spektrallinjers egenskaper ur stjärnspektran. Omfattningen av detta projekt innefattar att titta närmare på en av dessa egenskaper, spektrallinjebreddning orsakad av kollisionsbreddning av väte. Kollisionsbreddning av väte uppstår när en väteatom kolliderar med en annan partikel. Målet med projektet är att med framgång beräkna kollisionsbreddningen av spektrallinjer från järn där ny data saknas ur GES genom att använda moderna kvantmekaniska beräkningar. Dessa beräkningar är gjorda med den så kallade ABO-teorin, vilken är mer avancerad än tidigare etablerade teorier. En tabell med Fe-I (neutralt järn) spektrallinjer utan kollisionsbreddningsdata i GES har tillhandahållits. Med hjälp av ABO-teorin och den medföljande ABO-tvärsnittsräknar-koden har beräkningar av kollisionsbreddning med väte utförts för dessa linjer. De nya beräkningarna förutser att spektrallinjernas bredd blir typiskt två gånger så stor jämfört med de äldre beräkningarna gjorda med enklare teori. Denna nya data kan förväntas att förbättra analysen av stjärnspektrum ur Gaia-ESO kartläggningen.
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Eremeev, Kirill. « Brοadband emitting materials dοped with thulium and hοlmium iοns fοr sοlid-state lasers at 2 μm and beyοnd ». Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMC232.

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De nouveaux matériaux inorganiques actifs au laser, dopés avec des ions de thulium et d'holmium, ont été étudiés pour leur potentiel dans les lasers à accord large et ultrarapides fonctionnant dans la gamme spectrale infrarouge à ondes courtes de 2 à 3 μm. Les lasers émettant dans cette gamme spectrale trouvent de nombreuses applications, notamment dans les systèmes de télédétection par laser, la détection de gaz et la médecine. Ils sont utilisés comme systèmes amplificateurs pour la génération d’harmoniques d’ordre élevé, la génération de térahertz, et la conversion ultérieure de fréquence dans la région infrarouge moyen.La présente thèse de doctorat établit des relations entre les propriétés structurelles des matériaux cristallins d'oxydes et de fluorures, sous forme de monocristaux et de céramiques transparentes, et les propriétés spectroscopiques des ions dopants de thulium et d'holmium, ainsi que leurs caractéristiques laser, qui sont essentielles pour le développement des lasers. De plus, les processus physiques sous-jacents à un comportement laser inattendu sont révélés. Cette étude systématique des matériaux laser permet d'identifier les compositions les plus prometteuses pour le développement de lasers à large accordabilité et à impulsions ultracourtes.Cette étude se concentre principalement sur des matériaux présentant un élargissement spectral inhomogène significatif, se traduisant par des spectres d'absorption et d'émission larges et sans structure des ions dopants. Afin de promouvoir cet effet, plusieurs stratégies ont été envisagées, notamment l'agrégation d'ions de terres rares, le désordre de la structure locale, le désordre de composition dans les composés à solution solide et les bandes latérales de phonons résultant des interactions électron-phonon.La formation d'agrégats de thulium et d'holmium dans des cristaux de fluorure de calcium permet une opération laser efficace et à accord large autour de 2,1 μm. Une étude spectroscopique polarisée des propriétés d'émission des ions d'holmium dans des cristaux désordonnés d'aluminate de terres rares met en lumière ses propriétés spectrales à large bande et le rôle de l'émission assistée par multiphonons, qui se produit au-delà des transitions électroniques, dans les émissions laser inattendues observées dans les lasers à verrouillage de modes. Dans les céramiques à solution solide sesquioxyde du système ternaire yttria-lutécia-scandia dopées avec des ions de thulium, il existe une variation forte et presque linéaire de la force du champ cristallin avec la taille moyenne du cation formant l'hôte. Cette relation permet de personnaliser à la fois la position et la largeur de la bande d'émission au-delà de 2 μm en ajustant de manière appropriée la composition de l'hôte. Des opérations laser très efficaces des sesquioxydes dopés au thulium et à l'holmium autour de 2,1 μm et 2,3 μm ont été démontrées
Novel laser-active inorganic materials doped with thulium and holmium ions have been investigated for their potential in broadly tunable and ultrafast lasers operating in the short-wave infrared spectral range of 2 to 3 μm. Lasers emitting within this spectral range find numerous applications, including light detection and ranging systems, gas sensing, medicine. They are used as amplifying systems for high harmonic generation and terahertz generation, and further frequency conversion into the mid-infrared region.The present PhD thesis establishes relationships between the structural properties of oxide and fluoride crystalline materials, in the form of single crystals and transparent ceramics, and the spectroscopic properties of thulium and holmium dopant ions, along with their laser characteristics, which are essential for laser development. Moreover, the physical processes underlying unexpected laser behaviour are revealed. This systematic study of laser materials allows for the identification of the most promising compositions for the development of broadly tunable and ultrashort pulse lasers.This study mainly focuses on materials that exhibit significant inhomogeneous spectral line broadening, resulting in broad and structureless absorption and emission spectra of the dopant ions. In order to promote this effect, several strategies have been considered, including rare-earth ion clustering, local structure disorder, compositional disorder in solid-solution compounds, and phonon-sidebands arising from electron-phonon interactions.The formation of thulium and holmium clusters in calcium fluoride crystals enables efficient and broadly tunable laser operation around 2.1 μm. A polarized spectroscopic study of the emission properties of holmium ions in disordered calcium rare-earth aluminate crystals sheds light on its broadband spectral properties and on the role of multiphonon assisted emission, which occurs beyond electronic transitions, in unexpected laser emissions observed in mode-locked lasers. In solid-solution sesquioxide ceramics of the yttria-lutetia-scandia ternary system doped with thulium ions, there is a strong and nearly linear variation of the crystal-field strength with the mean size of the host-forming cation. This relationship allows for the customization of both the position and width of the emission band above 2 μm by appropriately adjusting the host composition. Highly efficient laser operations of thulium- and holmium-doped sesquioxides around 2.1 μm and 2.3 μm have been demonstrated
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Rowe, Penny. « Measurements of the foreign-broadened continuum of water vapor in the 6.3 micron band at -30 celsius / ». Thesis, Connect to this title online ; UW restricted, 2004. http://hdl.handle.net/1773/8604.

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Hultquist, Adam. « Collisional broadening by hydrogenfor stellar spectroscopy : extension towards high-lying states ». Thesis, Uppsala universitet, Teoretisk astrofysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-389326.

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The object of this thesis is to extend the current tables for two useful quantities when calculatingcollisional broadening, the cross-section of interaction and the velocity parameter.These quantities, which have hitherto been tabulated for lower states, have now been calculatedfor higher lying states and are used in the ABO - model for spectral line broadening.Having larger tables for these values enables broadening calculations for more spectral linesand this thesis shows examples of calculations which beneted from this. During the calculationsof the tables some unexpected behaviour in the distribution of values arose whichhas not been seen previously. This could point to an unknown underlying mechanism.
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Al, Moulla Khaled. « The solar Mg abundance from strong spectral lines in the infrared ». Thesis, Uppsala universitet, Teoretisk astrofysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-399039.

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This project aims to determine the solar Mg abundance with two infrared spectral lines: MgI λ10811 and λ10965. Downloaded line data from VALD are updated with modern values for the oscillator strengths and van der Waals damping parameters, the latter obtained through ABO theory. Utilizing SME, the Mg abundances of synthetic spectra are fitted with respect to a solar atlas. The derived abundance for varied turbulence configurations is found to be between logAMg+12 = 7.40–7.52, which is slightly lower than meteoric and 3D-modeled values. Suggested improvements would be to consider the effects of NLTE and line blending.
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Rosenmann, Laurence. « Etudes théorique et expérimentale de l'élargissement par collisions des raies de CO2 perturbé par CO2, H2O, N2 et O2 : constitution d'une base de données infrarouge et Raman appliquée aux transferts thermiques et à la combustion ». Châtenay-Malabry, Ecole centrale de Paris, 1988. http://www.theses.fr/1988ECAP0071.

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Etude systématique des coefficients d'élargissement par collisions des raies infrarouge et Raman de dioxyde de carbone perturbé par dioxyde de carbone, eau, diazote et dioxygène. Les résultats obtenus dans la gamme de température 300-3000 K sont utiles pour modéliser les transferts radiatifs en particulier dans les systèmes de combustion, et pour les diagnostics infrarouge et Raman.
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Levi, Di Leon Rémi. « Etude théorique et expérimentale de l'absorption par CO2 et H2O dans le domaine infrarouge à température élevée ». Châtenay-Malabry, Ecole centrale de Paris, 1986. http://www.theses.fr/1986ECAP0026.

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Un code de calcul raie par raie des propriétés radiatives de mélanges gazeux hétérogènes et anisothermes CO2, H2O, CO, N2, o a été construit a partir de données spectroscopiques, applicable de 300 à 2500 K de 0,1 à 50 ATM, et dans tout le domaine infrarouge. Réalisation d'un montage de mesure de la transitivité d'un gaz a température élevée
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Lazar, Gavanski. « Određivanje Starkovih poluširina spektralnih linija jonizovanog kiseonika i silicijuma, emitovanih iz plazme proizvedene u elektromagnetnoj udarnoj T-cevi ». Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2017. https://www.cris.uns.ac.rs/record.jsf?recordId=102415&source=NDLTD&language=en.

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Ispitivana je zavisnost brzine fronta udarnih talasa u T-cevi od više parametara. Izvršeno je povezivanje ICCD kamere sa spektrometrom. Ispitane su karakteristike celokupnog sistema i izvršena je njegova optimizacija i kalibracija. Izmerene su Štarkove poluširine 45 spektralnih linija OII, 13 spektralnih linija Si II i 14 spektralnih linija Si III. Dobijene vrednosti su upoređene sa vrednostima koje se mogu naći u literature, kao i sa teorijskim vrednostima. Urađena je detaljna analiza rezultata iz ovog rada kao i svih dostupnih prethodno dobijenih eksperimentalnih podataka.
The dependence of shock front velocity on different parameters was examined. The ICCD camera was mounted on the spectrometer. The characteristics of the whole system were examined and the system was optimized and calibrated. The Stark halfwidths of 45 O II spectral lines, 13 Si II spectral lines and 14 Si III spectral lines were measured. The obtained values were compared with the data available in the literature, as well as with theoretical values. A detailed analysis of both the experimental results given in this dissertation and previously published experimental data was done.
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Livres sur le sujet "Inhomogeneous spectral line broadening"

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Sobel'man, I. I. Excitation of atoms and broadening of spectral lines. 2e éd. Berlin : Springer, 1995.

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International, Conference on Spectral Line Shapes (15th 2000 Berlin Germany). Spectral line shapes : 15th ICSLS, Berlin, Germany, 10-14 July 2000. Melville, New York : American Institute of Physics, 2001.

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International Conference on Spectral Line Shapes (15th 2000 Berlin, Germany). Spectral line shapes. : 14th ICSLS, Berlin, Germany, 10-14 July 2000. Sous la direction de Seidel Joachim. Melville, N.Y : American Institute of Physics, 2001.

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Musielok, Józef. Starkowskie rozszerzenie linii widmowych i jego wykorzystanie w diagnostyce plazmy. Opole : Wyższa Szkoła Pedagogiczna im. Powstańców Śląskich w Opolu, 1991.

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Sobelʹman, I. I. Excitation of atoms and broadening of spectral lines. 2e éd. New York : Springer, 1995.

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Wittingham, I. B. S-matrix for broadening of helium spectral lines by helium perturbers. Townsville, Queensland : Physics Department, James Cook University, 1988.

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Whittingham, I. B. S-matrix for broadening of helium spectral lines by helium perturbers. Townsville, Qld : Physics Dept., James Cook University of North Queensland, 1988.

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Dimitrijević, Milan S. Line shapes investigations in Yugoslavia II, 1985-1989 : (bibliography and citation index) = Istraživanje oblika spektralnih linija u Jugoslaviji II, 1985-1989 : (bibliografija i indeks citata). Beograd : Astronomical Observatory, 1991.

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Nesmelova, L. I. Kontur spektralʹnoĭ linii i mezhmolekuli︠a︡rnoe vzaimodeĭstvie. Novosibirsk : Nauka, 1986.

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Dimitrijević, Milan S. Line shapes investigations in Yugoslavia and Serbia IV (1993-1997) : Bibliography and citation index = Istraživanje oblika spektralnih linija u Jugoslaviji i Srbiji (1993-1997) : bibliografija i indeks citata. Beograd : Astronomical Observatory, 1997.

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Chapitres de livres sur le sujet "Inhomogeneous spectral line broadening"

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Lebedev, Vladimir S., et Israel L. Beigman. « Spectral-Line Broadening and Shift ». Dans Physics of Highly Excited Atoms and Ions, 251–81. Berlin, Heidelberg : Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-72175-5_9.

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Kogan, V. I., V. S. Lisitsa et G. V. Sholin. « Spectral-Line Broadening in a Plasma ». Dans Reviews of Plasma Physics, 261–334. Boston, MA : Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1777-7_4.

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Kogan, V. I., V. S. Lisitsa et G. V. Sholin. « Spectral-Line Broadening in a Plasma ». Dans Reviews of Plasma Physics, 261–334. Boston, MA : Springer US, 1987. http://dx.doi.org/10.1007/978-1-4615-7778-2_4.

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Vince, I., et M. S. Dimitrijevic. « Pressure Broadening and Solar Spectral Line Bisectors ». Dans Solar and Stellar Granulation, 93–97. Dordrecht : Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0911-3_14.

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Vince, Ištvan, Milan S. Dimitrijević et Vladimir Kršljanin. « Pressure Broadening and Solar Limb Effect ». Dans Progress in Stellar Spectral Line Formation Theory, 373–80. Dordrecht : Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5372-7_30.

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Riascos L, H. « Spectral Broadening of the 3463 Å Line in a Zirconium Plasma Generated by Laser Irradiation ». Dans Plasma Physics, 529–32. Dordrecht : Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4758-3_64.

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« Spectral line broadening ». Dans Principles of Plasma Spectroscopy, 54–131. Cambridge University Press, 1997. http://dx.doi.org/10.1017/cbo9780511524578.005.

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« Spectral Line Broadening ». Dans Fundamentals of Laser Physics, 35–48. WORLD SCIENTIFIC, 2023. http://dx.doi.org/10.1142/9789811265280_0004.

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Salzmann, David. « Line Broadening ». Dans Atomic Physics in Hot Plasmas, 168–87. Oxford University PressNew York, NY, 1998. http://dx.doi.org/10.1093/oso/9780195109306.003.0007.

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Abstract The width of spectral lines emitted from astrophysical and laboratory plasmas is an extremely valuable diagnostic tool for the study of the plasma conditions surrounding the emitting ion. The line width is a parameter that is very sensitive to the local microfield around the emitting ions, and can be used, therefore, to provide information about the local temperature and density conditions that cannot be obtained by other diagnostic means.
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« SPECTRAL SHAPES : HOMOGENEOUS AND INHOMOGENEOUS BROADENING ». Dans Photosynthetic Excitons, 139–96. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812813664_0005.

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Actes de conférences sur le sujet "Inhomogeneous spectral line broadening"

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Fakhr-Eslam, S. H., G. D. Sheldon, J. R. Drummond et A. D. May. « Evidence of inhomogeneous broadening and shifting in the Raman Q branch of ». Dans SPECTRAL LINE SHAPES. ASCE, 1999. http://dx.doi.org/10.1063/1.58335.

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Babin, S. A. « Broadening of multipeak spectral structure by inhomogeneous pump field ». Dans The 15th international conference on spectral line shapes. AIP, 2001. http://dx.doi.org/10.1063/1.1370690.

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Marcano, A., O. M. C. Salazar, J. L. Paz, I. Reif et H. J. Franco. « Nonlinear spectra of a homogeneously and inhomogeneously broadened two-level system ». Dans OSA Annual Meeting. Washington, D.C. : Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.tuu10.

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Polarization and Rayleigh type optical mixing spectra of a homogeneously and inhomogeneously broadened two-level system are calculated. We show that the nonlinear signal has contributions from the population pulsation and saturation effect. In the homogeneous system these effects can induce an asymmetric spectrum when the probe frequency is different from the resonant value. In the inhomogeneous system the spectral response is always symmetric independent of the probe frequency value. Line saturation and dynamic stark splitting are substantially reduced in the inhomogeneous case. The mentioned differences can be used to identify the type of broadening of a given spectral line.
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Skinner, J. L. « Theory of Impurity Lineshapes in Crystals, Glasses, and Liquids ». Dans Spectral Hole-Burning and Luminescence Line Narrowing : Science and Applications. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/shbl.1992.wa2.

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Spectral lineshapes of impurities in condensed phases provide useful information about structure and dynamics. Understanding the origin of line broadening may facilitate the design of novel experimental techniques that could have useful technological applications. In this talk I will outline our recent theoretical work on inhomogeneous lineshapes of impurities in crystals and glasses, and on the crossover from inhomogeneous to homogeneous broadening in liquids.
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Dian, J., F. Adamec, M. Ambroz, J. Psencik, M. Vacha et J. Hala. « Fluorescence Line Narrowing and Hole Burning of Uroporphyrin ». Dans Spectral Hole-Burning and Luminescence Line Narrowing : Science and Applications. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/shbl.1992.tub6.

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Uroporhyrin, like other natural porphyrins such as coproporphyrin or protoporphyrin, is an important intermediate occurring in the metabolic pathway to protoheme. These porphyrins are important indicators of pathogenic states in an organism. Luminescence spectra of these molecules consist of (≈ 100 cm–1) broad bands due to an inhomogeneous broadening. Fluorescence line narrowing and hole burning spectroscopies enable to remove an inhomogeneous broadening and high resolution spectra can be obtained (≈ 5 cm–1 and ≈ 0.01 cm–1, respectively). Low temperature optical spectra of coproporphyrin and protoporphyrin in various matrices have been measured [1-4]. The aim of this contribution is to present hole burning and fluorescence line narrowing spectra of uroporphyrin.
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Jaaniso, R., H. Hagemann et H. Bill. « Inhomogeneous broadening and spectral hole burning in SryBa1-yFClxBr1-x : Sm2+ ». Dans Spectral Hole-Burning and Luminescence Line Narrowing : Science and Applications. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/shbl.1992.tub10.

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Wald, L. L., E. L. Hahn et M. Lukac. « Optical Pumping Detection of Anomalous NQR Spectra of Pr3+ in Pr3+:LaF3 ». Dans Persistent Spectral Hole Burning : Science and Applications. Washington, D.C. : Optica Publishing Group, 1991. http://dx.doi.org/10.1364/pshb.1991.sa5.

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The nature of inhomogeneous broadening in rare earth systems plays an important role in the dynamical optical properties of ions in crystals. For this reason much of the work on the nature of the inhomogeneous broadening in rare earth doped systems has concentrated on the investigation of ion-ion interactions such as spectral transfer and up conversion processes.1,3 Variations in homogeneous optical dephasing times across the inhomogeneous optical line have also been reported.4 These studies concentrate on the variations of collective effects of ion- ion interactions at different positions in the inhomogeneous optical line in relatively heavily doped rare earth systems. We report variations in optically detected NQR (ODNQR) linewidths and shifts of Pr3+ hyperfme transitions in the optical ground state as a function of position in the inhomogeneous optical line and for satellite transitions of the 1D2-3H4 transition in lightly doped (0.5 at. %) Pr3+:LaF3.
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Brown, Ross. « On the Study of Inhomogeneous Broadening and Related Quantities by Molecular Dynamics and Quantum Chemistry. » Dans Spectral Hole-Burning and Luminescence Line Narrowing : Science and Applications. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/shbl.1992.tub34.

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Most resonances of molecules, such as optical, infra-red or electron spin resonance transitions are shifted and broadened in solids, compared to the spectra of the isolated molecule in the gaseous phase. Inhomogeneous or statistical broadening reflects the variety of surroundings felt by the many molecules probes in a sample while homogeneous broadening, a dynamical effect, is caused for example by the elastic Interaction of the electronic degrees of freedom with intermolecular phonons, or structural rearrangement by tunneling relaxation (two level systems). Homogeneous linewidths at low temperatures are much larger in amorphous materials than in crystals, with quite different temperature dependencies, reflecting the kind and density of modes coupled to the electronic transition. Hence, homogeneous broadening can add to our understanding of the differences between crystals and glasses, and has been studied intensively.
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Güttler, Frank, Marco Pirotta, Alois Renn et Urs P. Wild. « Single molecule spectroscopy : Stark effect of pentacene in p-terphenyl ». Dans Spectral Hole-Burning and Luminescence Line Narrowing : Science and Applications. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/shbl.1992.mb1.

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Based on the occurrence of extremely narrow zero phonon lines and their inhomogeneous distribution spectroscopic isolation of single absorbers in solid matrices can be achieved. Pentacene molecules in a p-terphenyl host crystal have been studied at cryogenic temperatures using absorption [1] and fluorescence excitation [2,3] techniques. Such investigations provide information on a variety of guest host properties such as homogeneous dephasing, spectral diffusion [3] and inhomogeneous broadening. Single molecule detection also is a key to the investigations of fundamental spectroscopic properties of individual molecules.
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Materials, Amorphous, et L. Kador. « Temperature Cycling of Persistent Hole Spectra : A Method for Investigating the TLS Density in ». Dans Spectral Hole-Burning and Luminescence Line Narrowing : Science and Applications. Washington, D.C. : Optica Publishing Group, 1992. http://dx.doi.org/10.1364/shbl.1992.tub11.

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Persistent hole burning yields a spectral resolution of the order of the homogeneous linewidth, which, especially in the case of amorphous materials, greatly improved the utility of optical spectroscopy. However, the homogeneous linewidth itself can in general not be measured in a hole-burning experiment, since in virtually all disordered solids the hole width is affected by spectral diffusion [1,2]. The time [3] and temperature [4] dependence of spectral diffusion, on the other hand, can be investigated by fast hole-burning measurements and by thermal cycling, respectively. During a thermal cycle, spectral diffusion gives rise to an additional irreversible inhomogeneous broadening component of a hole spectrum because at a higher excursion temperature more tunneling states or TLS of the glassy matrix are in thermal equilibrium than at the burning temperature. This irreversible broadening yields information on the activation energies of the TLS [4,5].
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Rapports d'organisations sur le sujet "Inhomogeneous spectral line broadening"

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White, Jackson. Spectral Line Broadening at High Densities. Office of Scientific and Technical Information (OSTI), avril 2024. http://dx.doi.org/10.2172/2337637.

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Griem, H. Experimental study of population inversion and spectral line broadening in a plasma containing a mixture of high Z and low Z ions. Office of Scientific and Technical Information (OSTI), octobre 1988. http://dx.doi.org/10.2172/7264387.

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