The high resolution infrared spectra of SiH${}_4$were recorded with Bruker IFS120 and IFS125 HR Fourier transform infrared spectrometers at an optical resolution of 0.0021 and 0.0025 cm${}^{-1}$and analyzed in the region of 1600–2100 cm${}^{-1}$where the first bending overtone $2{\nu }_2,$$2{\nu }_4$and combinational ${\nu }_2+{\nu }_4$bands are located. The number of 640/1114/2667 transitions with $J^{\text{max}}$= 23 were assigned to the bands $2{\nu }_2$($A_1$- and $E$-type sub–bands), $2{\nu }_4$($A_1$-, $E$- and $F_2$-type sub–bands) and ${\nu }_2+{\nu }_4$($F_1$- and $F_2$-type sub–bands) of the ${}^{28}$SiH${}_4$molecule. The subsequent weighted fit of experimentally assigned transitions was made with the Hamiltonian model which takes the resonance interactions between seven vibrational states ($(0200,A_1),$$(0200,E),$$(0101,F_1),$$(0101,F_2),$$(0002,A_1),$$(0002,E)$and $(0002,F_2)$) into account. As the result, a set of 73 fitted parameters was obtained which reproduces the initial 4421 experimental transitions with the $d_{\text{rms}}=3.31\times {10}^{-4}$ cm${}^{-1}$. On the basis of the obtained results, 4940 hot transitions were assigned in the high resolution spectra of the Dyad region studied before. The corresponding analysis was made for the ${}^{29}$SiH${}_4$and ${}^{30}$SiH${}_4$isotopologues. A line list of 12,698 experimental transitions for both the “cold” and “hot” transitions of all three isotopologues is presented.

SiH的高分辨率红外光谱${}_4$用布鲁克IFS120和IFS125 HR傅里叶变换红外光谱仪记录的光学分辨率为0.0021和0.0025 cm${}^{-\mathrm{1个}}$并在1600–2100 cm范围内进行分析${}^{-\mathrm{1个}}$第一个弯曲泛音在哪里 $2{\nu }_2，$$2{\nu }_4$和组合 ${\nu }_2+{\nu }_4$乐队位于。640/1114/2667转换的数量${Ĵ}^{\text{最高}}$= 23个被分配给乐队 $2{\nu }_2$（${\mathrm{一种}}_{\mathrm{1个}}$-和 $Ë$型子频带）， $2{\nu }_4$（${\mathrm{一种}}_{\mathrm{1个}}$-， $Ë$-和 $F_2$型子频带）和 ${\nu }_2+{\nu }_4$（$F_{\mathrm{1个}}$-和 $F_2$型子带） ${}^{28}$硅氢${}_4$分子。通过哈密顿模型对实验分配的跃迁进行后续加权拟合，该模型采用了七个振动状态之间的共振相互作用（$（0200，{\mathrm{一种}}_{\mathrm{1个}}），$$（0200，Ë），$$（0101，F_{\mathrm{1个}}），$$（0101，F_2），$$（0002，{\mathrm{一种}}_{\mathrm{1个}}），$$（0002，Ë）$和 $（0002，F_2）$）。结果，获得了一组73个拟合参数，这些参数重现了初始4421实验过渡，其中$d_{\text{均方根}}=3.31\times {10}^{-4}$ 厘米${}^{-\mathrm{1个}}$。根据获得的结果，在之前研究的Dyad区的高分辨率光谱中分配了4940个热转变。相应的分析是针对${}^{29}$硅氢${}_4$和 ${}^{30}$硅氢${}_4$同位素。给出了所有三种同位素分子的“冷”和“热”转变的12,698个实验转变的直线列表。