Knowledge Bank

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 $TiCl4$ or $TiF4$ 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 $6861.7cm-1$ have been assigned as the 0-0, 1-1 and 2-2 bands of a new $\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Sigma -2\Sigma$ 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 $12000-14000cm-1$ spectral region with the 0-0 band near $13232cm-1$. These bands consist of four sub-bands, $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Delta 1/2-4\Phi 3/2,4\Delta 3/2-4\Phi 5/2,4\Delta 5/2-4\Phi 7/2$ and $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Delta 7/2-4\Phi 9/2$, of a $\mathrm{<mrow\; data-mjx-texclass="ORD">4</mrow>}\Delta -X4\Phi$ transition. A rotational analysis of the 0-0 and 0-1 bands has been obtained and the spectroscopic constants have been extracted.