Line strengths, widths and shifts analysis of the 2ν2, ν2 +ν4 and 2ν4 bands in 28SiH4, 29SiH4 and 30SiH4

The high resolution infrared spectra of SiH 4 in its natural abundance were recorded with a Bruker IFS125 HR Fourier transform infrared spectrometer at an optical resolution of 0.003 cm(-1) and analyzed in the region of 1600-2100 cm(-1) where the first bending overtone 2 nu(2), 2 nu(4) and combinational nu(2) +nu(4) bands are located. A line strength analysis of the 2018 (1636/211/171) experimentally recorded transitions of the (SiH4)-Si-28, (SiH4)-Si-29, and (SiH4)-Si-30 species was made by the fit of their line shapes with the Hartmann-Tran profile and 9 effective dipole moment parameters (7/1/1 fitted parameters for the (SiH4)-Si-28, (SiH4)-Si-29 and (SiH4)-Si-30 species, respectively) were obtained from the weighted fit which reproduce initial experimental line strengths of (SiH4)-Si-28, (29) SiH4 and (SiH4)-Si-30 with the d rms = 3.65%, 3.77% and 3.46%. Self-broadening coefficients of 1064 lines (typically lying between (8 and 10)x10(-2) cm(-1) . atm(-1)) and self-shift coefficients of 785 lines (typically lying between (5 and 10) x10-3 cm(-1).atm(-1)) of all three isotopologues of silane were determined from the multi-spectrum analysis of these lines. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

The study recorded high resolution infrared spectra of SiH4 in its natural abundance and analyzed specific bands in the 1600-2100 cm(-1) region. Effective dipole moment parameters and self-broadening coefficients of different isotopologues of silane were obtained through line strength analysis and multi-spectrum analysis.