Absorption Spectrum of HSiI

Abstract

A new absorption spectrum in the region 4600-5600 A has been discovered in the flash photolysis of silyl iodide, SiH,I. A rotational analysis, together with the observation of a deuterium isotope shift, has shown that the spectrum is due to the HSiI radical.The lower electronic state of HSiI is a 'A' state with a bond angle of -103", and the upper state is 'A" with angle -116". Axis-switching effects, due to the increase in bond angle, cause the appearance of A K = 0, +2 subbands, in addition to the ordinary A K = + 1 subbands.--

Direct Kinetic Studies of Silicon Hydride Radicals in the Gas Phase

“…Most recently improvements have been made by the refinement of the uncertainty rather than by any dramatic change in the value. In the gas kinetic studies this has been because the new SiH2 kinetic data,52,130 discussed in this review, is now extensive enough in its temperature and pressure ranges to be used directly to obtain equilibrium constants for the processes SiH4 52 SiH2 + H2 (29) Si2H6 -SiH2 + SiH4 (30) under common conditions for both forward and reverse processes, without resort to extrapolation of the data. On the theoretical side Grev and Schaefer10 have found a discrepancy between experiment and calculation of the atomization energy of SiH4 of ca.…”

Spectroscopic Investigation of the Electronic Ã1A′′−X̃1A′ Transition of HSiNC

“…Later, reinvestigations of HSiCl and HSiBr were carried out by the Clouthier group using high-resolution laser-induced fluorescence (LIF) spectroscopy and supersonic jet techniques allowing better resolved spectra of both species to be obtained. , As a result, the Clouthier group were able to further confirm the identity of the spectral carriers and conclusively identify the peaks attributed to axis-rotation, as there was no evidence of spin splittings. Work on HSiF and HSiI have also been carried out and they also show the effects of axis-rotation. − …”

“…Work on HSiF and HSiI have also been carried out and they also show the effects of axis-rotation. [5][6][7] Over the last two decades a number of research groups have carried out theoretical and experimental studies to obtain spectroscopic parameters to aid in the detection of new silicon containing species. One of these investigations lead to two new species, HSiCN and HSiNC, being spectroscopically observed in the laboratory.…”

Spectroscopy and structures of free radicals and molecular ions

“…It is a little surprising that almost no spectroscopic studies have been carried out on this molecule, while HSiCl [38], HSiBr [38], and HSil [39] have already been extensively investigated by high-resolution electronic spectroscopy. The silylene is the Si analogue of the carbene, and is expected to play important roles in reactions of silicon compounds as the carbene does in organic reactions (see Section V).…”