High-Resolution Study of the Infrared Spectrum of H3SiI in the Regions 330-680 and 1070-1360 cm-1: Accurate Determination of the Ground State Constants.

High-resolution FTIR spectra of H3SiI have been recorded in the regions 330-680 cm-1 (nu3/nu6) and 1070-1360 cm-1 (2nu6). A detailed rovibrational study was carried out for the nu3 and nu6 fundamental bands, 2nu6-/+2 and 2nu60 overtone bands, and two hot bands, 2nu6+/-2 - nu6+/-1 and 2nu60 - nu6. A local resonance between the v6 = 2 and v2 = v3 = 1 states was observed. Ground state combination differences deduced from the nu3, nu6, 2nu6-/+2, and 2nu60 bands allowed us to obtain accurate B0, DJ0, and DJK0 constants. The nu6, 2nu6+/-2 - nu6+/-1, and 2nu6-/+2 bands were used for the experimental determination of the A0 and DK0 constants, whereas the hot band 2nu60 - nu6 served to make the internal calibration coherent. Ground state differences DeltaK(J) = E0(J, K) - E0(J, K - 3) were calculated with K up to 12. By a least-squares fit, we obtained the following results:A0 = 2.8426037(14) cm-1 and DK0 = 2.75840(99) x 10(-5) cm-1.Copyright 1997 Academic Press. Copyright 1997Academic Press