High-resolution spectrum of the $\nu_{2}+\nu_{4}$ $(F_{1}, F_{2})$ and 2$\nu_{4}$ $(F_{2})$ bands of deuterated silane $^{28}$SiD$_{4}$

A study of the fine rotational structure of the silane molecule absorption spectrum was carried out for the first time. The high-resolution spectrum of $^{28}$SiD$_{4}$ was recorded in the 1260–1480 cm$^{-1}$ spectral range the vibrational $\nu_{2}+\nu_{4}$ $(F_{1}, F_{2})$ and 2$\nu_{4}$ $(F_{2})$ bands were theoretically analyzed. Rotational, centrifugal distortion, tetrahedral splitting and resonance interaction parameters of the upper vibrational states were obtained from the weighted least square fit method. The set parameters obtained reproduces the initial vibrational-rotational structure of the $\nu_{2}+\nu_{4}$ $(F_{1}, F_{2})$ and 2$\nu_{4}$ $(F_{2})$ bands with an accuracy of $d_{\operatorname{rms}}$ = 3.9 $\times$ 10$^{-4}$ cm$^{-1}$.