Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/10362
 Title: Local vibrational modes of natural isotopes of substitutional oxygen in CdTe Authors: Tarhan, EnverRamdas, Anant K. Keywords: Local vibrational modesOxygen impuritiesCadmium telluride Issue Date: 2020 Publisher: TÜBİTAK - Türkiye Bilimsel ve Teknolojik Araştırma Kurumu Abstract: We investigated the localized vibrational modes (LVM) of natural oxygen containing ${}^{16}O,\;{}^{17}O$ and ${}^{18}O$ isotopes at a substitutional tellurium site in cadmium telluride using infrared absorption spectroscopy at cryogenic temperatures. The main absorption peak observed at 350 cm ?1 was formerly attributed to a fundamental LVM mode (?0) of oxygen at a tellurium site. The relatively weak absorption peaks observed at 331 $cm^{-1}$ and 340 $cm^{-1}$ are assigned as the same $\nu_0$ mode of the ${}^{17}O$ and ${}^{18}O$ isotopes, respectively, based on their relative intensities and spectral positions. The spectral positions were confirmed with theoretical calculations using a linear chain model where the peak position at 350$cm^{-1}$ was taken as the reference for the ${}^{16}O$ isotope. From a least square analysis of the observed peak positions we were able to calculate the force constants from perturbation theory. A Lorentzian line shape analysis of each $\nu_0$ absorption peak, considering the effects of isotopic mass and natural abundance variations of the host Cd atoms, was also carried out to further confirm their assignments. Reasonably good line shape fittings were obtained for $\nu_0$ modes of all isotopes of oxygen. URI: https://doi.org/10.3906/fiz-1911-14https://hdl.handle.net/11147/10362https://search.trdizin.gov.tr/yayin/detay/354834 ISSN: 1300-01011303-6122 Appears in Collections: Physics / FizikScopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications CollectionTR Dizin İndeksli Yayınlar / TR Dizin Indexed Publications CollectionWoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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