TY  - JOUR
TI  - Local vibrational modes of natural isotopes of substitutional oxygen in CdTe
AB  - 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 cryogenictemperatures. The main absorption peak observed at 350 cm −1 was formerly attributed to a fundamental LVM mode(ν0) of oxygen at a tellurium site. The relatively weak absorption peaks observed at 331 $cm^{-1}$and 340 $cm^{-1}$are assignedas 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 positionat 350$cm^{-1}$ was taken as the reference for the ${}^{16}O$ isotope. From a least square analysis of the observed peak positionswe 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, wasalso carried out to further confirm their assignments. Reasonably good line shape fittings were obtained for $nu_0$ modesof all isotopes of oxygen.
AU  - Tarhan, Enver
AU  - RAMDAS, Anant K.
DO  - 10.3906/fiz-1911-14
PY  - 2020
JO  - Turkish Journal of Physics
VL  - 44
IS  - 3
SN  - 1300-0101
SP  - 247
EP  - 255
DB  - TRDizin
UR  - http://search/yayin/detay/354834
ER  -