A. CEAUSU, G. GRANER, Laboratoire de Physique Moléculaire et Applications, CNRS, Bât. 350, Campus d'Orsay, F-91405 Orsay Cédex, France; E. B. MKADMI AND H. BÜRGER, , Anorganische Chemie, FB 9, Universität-Gesamthochschule, D-42097 Wuppertal, Germany.
In a previous studyof monoisotopic D3Si35Cl, the analysis of the fundamental bands 3 and 6, linked by a Coriolis resonance, was reported. New Fourier transform infrared spectra of this compound were recorded in the 500 and 1000 cm-1 regions. The first purpose was to obtain accurate ground state constants. The 'normal' G.S. constants B0, DJ0, and DJK0 were deduced from GSCD. As for the constants A0 and DK0, they were obtained by the now well-established method of combining data from the fundamental 6, the overtone (26)\mp2 and the hot band (26)\pm2-(6)\pm1. Special care was taken to correct calibration differences between the two spectral regions. This was done by checking closed loops such as 3, 23, and 23 - 3 on one hand or 6,(26)0 and (26)0 - 6 on the other hand. The values obtained are A0 =1.427830 cm-1 and DK0=5.36× 10-6 cm-1 (provisional values). Some sextic H constants could also be determined. In a second stage, the upper state energies of (26)\pm2, (26)0, 23 and 3 + 6 were fitted together to obtain the upper state constants. Note that, due to the weakness of the 3 + 6 band, the hot bands 3 + 6 - 3 and 3 + 6 - 6 were used instead.