THE C3-DELTA-X3-DELTA, A3-PHI-X3-DELTA AND E3-PI-X3-DELTA SYSTEMS OF TIS

The thermal emission spectrum of TiS has been recorded with Fourier transform spectroscopy in two different regions, 10000-12600 cm-1 and 6000-8600 cm-1, with a resolution of 0.05 cm-1. The first region covers the C3DELTA-X3DELTA system while the second region covers the previously unobserved A3PHI-X3DELTA and E3PI-X3DELTA systems. Lines from 18 different vibrational bands were included in the analysis. Of these, 9 belong to the C3DELTA-X3DELTA system, 8 to the A3PHI-X3DELTA system, while only the (0, 0) band was observed in the E3PI-X3DELTA system. No satellite transitions were observed. Molecular constants have been determined for the four states. A perturbing state causing the observed local perturbations in the C3DELTA1 substate is suggested. The electron configurations of the four states have been discussed in terms of observed bond lengths.