Extended high resolution study of 28SiH4 in the region of the octad stretching–bending bands

Abstract

The infrared spectra of  ²⁸SiH${}_4$ were measured at varied experimental conditions with a Bruker Fourier transform infrared spectrometer IFS125HR and analyzed in the 2800–3400 cm⁻¹ region where eight sub-bands of the four stretching–bending bands of the octad are located. The 5670 transitions ($J^{\text{max}}=27$) belonging to these sub-bands were assigned (which is 5.5 times higher in comparison with the amount of corresponding data known from the literature) in the recorded experimental spectra and theoretically reproduced by a set of 130 parameters (band centers, rotational, centrifugal distortion, tetrahedral splitting and resonance interaction parameters) obtained from the weighted fit with the $d_{\text{rms}}$ deviation of $4.7\times 10^{-4}$ cm⁻¹. A list of assigned experimental transitions is presented as the Supplementary data to this paper.