Auswahl der wissenschaftlichen Literatur zum Thema „Spectroscopie TeraHertz en phase gazeuse“
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Zeitschriftenartikel zum Thema "Spectroscopie TeraHertz en phase gazeuse"
-Margulès, L. „Spectroscopie térahertz en phase gazeuse“. Revue de l'Electricité et de l'Electronique -, Nr. 01 (2003): 50. http://dx.doi.org/10.3845/ree.2003.006.
Der volle Inhalt der QuelleMounaix, P., S. Le Boiteux, M. Moustakim, R. Wunenburger, JP. Delville und L. Sarger. „Suivi du changement de phase CO2supercritique par spectroscopie TeraHertz femtoseconde“. Journal de Physique IV (Proceedings) 119 (November 2004): 243–44. http://dx.doi.org/10.1051/jp4:2004119077.
Der volle Inhalt der QuelleRoustila, Atika, und Jacques Chêne. „Etude par Spectroscopie XPS du Rôle de l’Hydrogène et de la Température sur la Ségrégation du Cérium dans le Composé Intermétallique CeNi2“. Journal of Renewable Energies 7, Nr. 1 (30.06.2004): 23–30. http://dx.doi.org/10.54966/jreen.v7i1.862.
Der volle Inhalt der QuelleDissertationen zum Thema "Spectroscopie TeraHertz en phase gazeuse"
Decker, Jean. „Analyse TeraHertz sur site en temps réel des composés réglementés à l’émission atmosphérique en phase gazeuse du Centre de Valorisation Énergétique de la Communauté Urbaine de Dunkerque“. Electronic Thesis or Diss., Littoral, 2024. http://www.theses.fr/2024DUNK0696.
Der volle Inhalt der QuelleIncineration with energy recovery is one of the main treatment methods for municipal waste. The residues and emissions generated by combustion generally present an environmental and health risk. The constant evolution of regulations is tending to control emissions more and more strictly, by extending standards to new substances and lower and lower emission thresholds. This development is only possible thanks to the development of measuring instruments. High-resolution THz spectroscopy offers the advantage to detect a large number of polar compounds at trace level, with exceptional selectivity enabling unambiguous detection without any prior information about the sample. These advantages make it a very interesting and complementary alternative to currently developed techniques. The aim of this thesis work was to demonstrate and evaluate the capacity of THz spectroscopy to be used as an instrument for real-time diagnosis and monitoring of compounds of environmental interest on industrial sites. The CVE of the Dunkirk Urban Community offered to take up this challenge. A spectrometer based on the use of a frequency multiplication chain has been developed, enabling the detection of most of the compounds regulated in waste incineration, in the single frequency band of 530-620 GHz covered by a single stage. The detection limits obtained are compatible with regulatory emission limit values. The installation of the instrument on site demonstrated the ability of spectroscopy to carry out real-time quantitative multi-component in-situ monitoring. Continuous measurements of SO₂ and CO over more than 24 hours were carried out at the CVE and comparison of the results with those of two certified infrared instruments (an automated measurement system and a portable analyser) showed excellent agreement. It should be noted that a frequency-modulated line profile model has been developed for the purpose of real-time relative quantification without recourse to calibration standards. To increase the instrument's sensitivity, the preconcentration technique was coupled to the spectrometer. Measurements were carried out over complete sampling and analysis times of no more than ten minutes, making it possible to measure various COVs in atmospheric emissions from the CVE, such as formaldehyde, methanol and acetone, at sub-ppm concentrations. We have thus demonstrated the ability of THz spectroscopy to individually detect and discriminate COVs semi-continuously on site. Such an instrument could therefore be used for process and emission measurements, as well as for environmental and ambient air applications
Elmaleh, Coralie. „Développement d’un prototype ultrasensible d’analyse de gaz dans le domaine submillimétrique“. Electronic Thesis or Diss., Littoral, 2024. http://www.theses.fr/2024DUNK0698.
Der volle Inhalt der QuelleThis thesis explores the technological development of a spectroscopic experiment in the submillimeter range, also known as Terahertz (THz). This spectral band stands out for its ability to precisely resolve molecular doublets, enabling clear and precise identification of complex gas mixtures, even when other wavelengths might fail.Although the THz region offers exceptional resolving power, spectrometers operating in this region often face sensitivity challenges due to the development of technology in this band. Thanks to an innovative approach, we have implemented the first Cavity Ring-Down Spectroscopy (CRDS) experiment capable of quantifying compounds to ppb precision. The study is concentrated between 550 GHz and 650 GHz, a window of the THz spectrum that not only offers unrivalled resolution and molecular sensitivity, but also possesses the ability to penetrate non-conducting materials while being non-ionizing. These properties position this technology at the cutting edge of analysis tools, promising a plethora of applications, from fundamental research to industrial applications
REMPP, MURIEL. „Reactivite en phase gazeuse de cations radicaux metastables ,-bifonctionnels“. Palaiseau, Ecole polytechnique, 1998. http://www.theses.fr/1998EPXX0004.
Der volle Inhalt der QuelleTabarin, Thibault. „Dynamique et conformation de biomolécules en phase gazeuse“. Lyon 1, 2007. http://tel.archives-ouvertes.fr/docs/00/19/87/49/PDF/These_T.Tabarin_Dedie.pdf.
Der volle Inhalt der QuelleWe have developed a new experimental set-up which couple a quadrupole ion trap mass spectrometer with a tuneable UV-Visible laser OPO. This thesis’s work deals with the optical properties and the photofragmentation of amino acids, peptides, DNA and silver cluster tryptophan complexes in gas phase. In the case of peptides, the UV excitation of chromophores in the systems leads to a specific fragmentation which can be controlled by laser wavelength. The fragmentation schemes obtained after laser excitation depends on the photo-induced charge transfer and can be linked to the system’s geometry. The optical spectra of the silver cluster tryptophan complexes supported by TD-DFT calculations allow an elaborate study of the electronics excitation, charge transfer and relaxation in a hybrid metal biomolecule system. The production and use of the radical fragment produce by photofragmentation or by photodetachment are also discussed and exemple on peptides and DNAs are further illustrated
Cirtog, Manuela. „Caractérisation des complexes hydratés d'intérêt atmosphérique par spectroscopie infrarouge en phase gazeuse“. Paris 6, 2011. http://www.theses.fr/2011PA066701.
Der volle Inhalt der QuelleSeydou, Mahamadou. „Structures en phase gazeuse et en phase liquide de systèmes moléculaires chargés d'intérêt biologique“. Paris 13, 2008. http://www.theses.fr/2008PA132006.
Der volle Inhalt der QuelleThis work presents the study of the acetylcholine neurotransmitter and its agonists, nicotine and muscarine through infrared spectroscopy. This study has been conducted both in gas-phase and aqueous phase. The used method for the isolated molecules is infrared multiphoton dissociation (IRMPD) coupled to mass spectrometry with the radiation isued from the free electron laser CLIO. For molecules in acid aqueous phase, Fourier-transform spectroscopy has been employed. The experimental results have been interpreted first trough a systematic conformational search at different levels of quantum chemistry followed by optimization of geometries and determination of vibrational frequencies. The emphasis has been set upon the search of pharmacophores. The conforntation between theory and experments has allowed a quantitative evaluation of structural modifications as well as the switch from the inactive to the bioactive form of nicotine due to the progressive addition of explicit water molecules
Marcinkiewicz, Michal. „Terahertz Spectroscopy of Topological Phase Transitions in HgCdTe-based systems“. Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTS068/document.
Der volle Inhalt der QuelleThis thesis presents an investigation of different topological phases in mercury-cadmium-telluride (HgCdTe or MCT) based heterostructures. These solid state systems are indeed a perfect playground to study topological states, as their band structure can be easily varied from inverted to non-inverted, by changing internal or external parameters.If a system has an inverted band ordering, its electronic structure has a non-trivial topology. One cannot change its topological order without closing the band gap, which is inevitably accompanied with the appearance of massless particles in the bulk. A system, that has an inverted band structure and a finite gap in which the Fermi level is positioned, is called a topological insulator. These novel materials are insulators in the bulk, but host gapless metallic states with linear dispersion relation at boundaries, protected against disorder and backscattering on non-magnetic impurities. These states arise at the interfaces between materials characterized by a different topological order. A 2D topological insulator is thus characterized by a set of 1D spin-polarized channels of conductance at the edges, while a 3D topological insulator supports spin-polarized 2D Dirac fermions on its surfaces.The 2D and 3D massless fermions have already been demonstrated experimentally in HgCdTe-based heterostructures. However, the topological phase transitions during which the massless particles appear remain barely explored. The HgCdTe band structure can be tuned from inverted to non-inverted using chemical composition, pressure, temperature, or quantum confinement. These parameters therefore allow to probe the system in the vicinity of different topological phase transitions. In this thesis, the use of temperature as continuous band gap tuning parameter allows to study the appearance and the parameters of semi-relativistic 2D Dirac and 3D Kane fermions emerging at the points of phase transitions.The systems investigated were Hg$_{1-x}$Cd$_x$Te bulk systems and HgTe/CdTe quantum wells characterized by an inverted and regular band order, and strained HgTe films which can be considered as 3D topological insulators with a residual quantum confinement. All these systems exhibit topological properties, and the experimental results are interpreted according to theoretical predictions based on the Kane model. This thesis is complemented by an overview and the preliminary results obtained on a different compound -- a InAs/GaSb broken-gap quantum well, which was also identified as a topological insulator. The structures were studied by means of terahertz and mid-infrared magneto-transmission spectroscopy in a specifically designed experimental system, in which temperature could be tuned in a broad range
Hui, Renjie. „Dissociation par capture d'électrons peptides en phase gazeuse : mécanisme et application en analyse protéomique“. Palaiseau, Ecole polytechnique, 2012. http://www.theses.fr/2012EPXX0002.
Der volle Inhalt der QuelleLafarge, Patricia. „Couplage chromatographie en phase gazeuse-spectrométrie de masse : principe, réalisation, pratique et intérêt analytique“. Paris 5, 1988. http://www.theses.fr/1988PA05P048.
Der volle Inhalt der QuelleLamarre, Nicolas. „Photoexcitation et relaxation de cyanopolyynes en phase gazeuse dans le domaine de l'ultraviolet du vide“. Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS167/document.
Der volle Inhalt der QuelleThis PhD thesis presents essentially an experimental work dealing with gas-phase molecular physics with astrophysical applications. The goal of the PhD is the study of the photoexcitation and relaxation of cyanopolyyne molecules that have been detected in different interstellar objects (molecular clouds, comets), and in planetary atmospheres (e.g. Titan). These molecules contribute to the carbon chemistry of these media by interacting with the interstellar radiation or with the solar flux in the vacuum ultraviolet range (VUV). The excited electronic structure of neutral cyanopolyynes was studied by absorption spectroscopy with a VUV Fourier-transform spectrometer. These experiments allowed us to identify the Rydberg states, and to measure the absolute photoabsorption cross section.Among the different open relaxation processes following a VUV photoexcitation, ionisation and dissociative ionisation have been investigated in detail using SOLEIL synchrotron radiation or laser sources of Centre Laser de l’Université Paris-Sud. Data on the ionisation potentials toward the first electronic states, vibrational frequencies, vibronic couplings, etc. were obtained on cyanopolyyne cations with the use of threshold photoelectron spectroscopy and zero-kinetic-energy photelectron spectroscopy. Finally, cationic species created by dissociative ionisation of cyanopolyynes were detected by mass spectrometry. The threshold energies were measured and the formation channel of these fragments was determined with the help of DFT calculations performed by a collaborator