FOURIER TRANSFORM EMISSION SPECTROSCOPY OF NEW ELECTRONIC TRANSITIONS OF TiCl and TiF

Abstract

The emission spectra of TiCl and TiF have been investigated at high resolution in the red and near infrared regions. TiF and TiCl were made in a microwave discharge lamp using a mixture of $TiCl_{4}$ or $TiF_{4}$ vapor and He, and the spectra were recorded using a Fourier transform spectrometer. Three new TiCl bands with origins near 6938.9, 6900.2 and $6861.7 cm^{-1}$ have been assigned as the 0-0, 1-1 and 2-2 bands of a new $^{2}\Sigma-^{2}\Sigma$ transition. This assignment is supported by our recent ab initio calculations on TiCl and ZrCl [Ram et al., J. Chem. Phys. 114, 3977-3987 (2001)]. The new TiF bands are located in the $12000-14000 cm^{-1}$ spectral region with the 0-0 band near $13232 cm^{-1}$. These bands consist of four sub-bands, $^{4}\Delta_{1/2} -^{4} \Phi_{3/2}, ^{4}\Delta_{3/2} -^{4} \Phi_{5/2}, ^{4}\Delta_{5/2} -^{4} \Phi_{7/2}$ and $^{4}\Delta_{7/2} -^{4} \Phi_{9/2}$, of a $^{4}\Delta - X^{4}\Phi$ transition. A rotational analysis of the 0-0 and 0-1 bands has been obtained and the spectroscopic constants have been extracted.