PURE ROTATIONAL SPECTRUM OF TiCl IN THE GROUND ELECTRONIC STATE

Author Institution: Institute for Astrophysics and Planetary Sciences, Idaraki University; Centre of Molecular Beam and Laser Chemistry, University of Waterloo; Institute for Astrophysics and Planetary Sciences, Ibaraki UniversityElectronic spectra of $TiCl$ have been studies for years by various spectroscopic methods. However, it is still not clear whether the ground state of $TiCl$ is $^{4}\Phi_{r}$ which is assumed to be the case by the analogy of TiH and the results of ab initio calculations. In this study, we have detected pure rotational spectra of $TiCl$ for four spin components by using a submillimeter-wave spectrometer with a combination of frequency and discharge modulations a Ibaraki University. $TiCl$ is generated in a DC glow discharge of a gas mixture of $TiCl_{4} (\sim 1 mTorr)$ and Ar buffer ($\sim 80$ mTorr). Discharge current is 40 mA, and mainly the 440 GHz region is surveyed. We have obtained effective spectroscopic constants for all the spin-components for v = 0 that are consistent with the previous FT results. Our analysis will provide very accurate structural information on the ground electronic state of this radical