Dissertations / Theses on the topic '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.
Full textFaid, Karim. "Stochastic theory of relaxation and collisional broadening of spectral line shapes." Diss., Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/13512.
Full textBengtsson, 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.
Full textAnalys 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.
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.
Full textNovel 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
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.
Full textHultquist, 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.
Full textAl, 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.
Full textRosenmann, 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.
Full textLevi, 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.
Full textLazar, 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.
Full textThe 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.
Lhuissier, Jean-François. "Etude de raies d'argon ionisé élargies par effet Stark." Rouen, 1987. http://www.theses.fr/1987ROUES002.
Full textAL, SALEH-MAHROUSSEH SALOUA. "Calcul relativiste, en electrodynamique quantique, de la diffusion compton sur un electron lie." Clermont-Ferrand 2, 1988. http://www.theses.fr/1988CLF21098.
Full textROUS, JEAN. "Proprietes electroniques de la vapeur dense de cesium, par transmission optique au voisinage du premier doublet de resonance." Paris 6, 1986. http://www.theses.fr/1986PA066429.
Full textDahoo, Pierre Richard. "Sur l'intensite et l'elargissement par la pression des raies de vibration-rotation des bandes nu3, nu1 plus nu3 et nu1 plus nu3 moins 2nu2-o de 12c1602 et nu3 de 14n2160 : etude experimentale et interpretation des parametres d'elargissement au moyen." Paris 6, 1988. http://www.theses.fr/1988PA066175.
Full textMANAR, ABDELKRIM. "Dynamique des proprietes optiques nonlineaires du chlorure de cuivre au voisinage des resonances electroniques." Université Louis Pasteur (Strasbourg) (1971-2008), 1989. http://www.theses.fr/1989STR13054.
Full textLu, Philip, and 盧正五. "The Spectral Line Broadening and Position Shift of the Ruby Zero-Phonon Lines with Temperature." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/34621299224295547660.
Full textNagy, Michelle. "Optical Properties of Magic-sized Nanocrystals: Absence of Inhomogeneous Line Broadening and Direct Evidence of Energy Transfer Between Two Magic Sizes." Thesis, 2009. http://hdl.handle.net/1807/18930.
Full textAhlefeldt, Rose. "Evaluation of a stoichiometric rare earth crystal for quantum computing." Phd thesis, 2013. http://hdl.handle.net/1885/14690.
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