FT VIBRATIONAL SPECTROSCOPY OF Si,C IN SOLID ARGON
Loading...
Date
1991
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
A Fourier transform study of the vibrational spectrum of Si,C produced by quenching the products of the vaporization of carbon/silicon mixtures in Ar at 13 K has confirmed a previously observed band at $1180.4 cm^{-1}$ as the $\nu^{^{\prime\prime}}_{a}(b_{2}$ antisymmetric 5i--C streching mode, and led to the identification of a new vibration at $839.5 cm^{-1}$ as the $\nu_{1}^{^{\prime\prime}}(a_{3})$ symmetric Si-Si streching mode. The $\nu_{2}^{^{\prime\prime}}(a_{3})$ bending mode was not observed. These results are confirmed by $^{13}{C_{r}}$, $^{19}{Si_{r}}$, and $^{30}{Si}$ isotopic data and are in excellent agreement with the predictions of second order perturbation theory [MBPT2/6-311G(2d)] calculations carried out in conjunction with this work. Force constant adjustment calculations based on these assignments confirm the ground state geometry as a floppy bent symmetrical structure.
Description
$^{1}$Work supported by the Welch Foundation (Grant P-0786) and the W.M. Keok Foundation.
Author Institution: Department of Physics, Box 32915, Texas Christian University
Author Institution: Department of Physics, Box 32915, Texas Christian University