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 tr ansform spectroscopy in two different regions, 10000-12600 cm-1 and 60 00-8600 cm-1, with a resolution of 0.05 cm-1. The first region covers the C3DELTA-X3DELTA system while the second region covers the previous ly unobserved A3PHI-X3DELTA and E3PI-X3DELTA systems. Lines from 18 di fferent vibrational bands were included in the analysis. Of these, 9 b elong to the C3DELTA-X3DELTA system, 8 to the A3PHI-X3DELTA system, wh ile only the (0, 0) band was observed in the E3PI-X3DELTA system. No s atellite transitions were observed. Molecular constants have been dete rmined for the four states. A perturbing state causing the observed lo cal perturbations in the C3DELTA1 substate is suggested. The electron configurations of the four states have been discussed in terms of obse rved bond lengths.