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The First Si–H Stretching Overtone of H3SiD: Emergence of Local Mode Effects

✍ Scribed by G. Graner; O. Polanz; H. Bürger; H. Ruland; P. Pracna

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
317 KB
Volume
188
Category
Article
ISSN
0022-2852

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✦ Synopsis

The FTIR spectrum of H 3 SiD in the 4100-4500-cm 01 region was recorded at Doppler-limited resolution, and four bands were studied. At lower wavenumbers, two strong bands, which in the local mode picture can be assigned to (200, E) (n 0 Å 4308.5667 cm 01 ) and (200, A 1 ) (n 0 Å 4307.8441 cm 01 ), were analyzed, and at higher wavenumbers, two weaker bands, namely (110, E) at 4378.1950 cm 01 and (110, A 1 ) at 4375.9763 cm 01 , were analyzed. A total number of Ç1900 lines in the strong dyad and 1000 lines in the weak one were assigned and fitted with standard deviations of the residuals É0.0008 cm 01 . The strong system ( ) is close to local mode behavior, with no x, y Coriolis term needed and only a small z Coriolis term, and simple arithmetic relations between vibration-rotation parameters are fulfilled as expected. The local mode behavior of the weak system (110) is less pronounced, but z and x, y Coriolis effects are smaller than in the Si-H stretching fundamentals. Comparison of computed and observed spectra provided a good estimate for the ratios of transition moments of the different bands: they are, in absolute value,

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