The infrared spectra of SiD${}_4$ in natural abundance were measured in the region of 350–2050 cm${}^{-1}$ with a Bruker IFS 125HR Fourier transform interferometer at an optical resolution of 0.0021 and 0.0016 cm${}^{-1}$ and analyzed. Not less than 6490 transitions with $J^{\text{max}}$ = 33 were assigned for the first time to the bands $2{\nu }_4$, ${\nu }_2+{\nu }_4$, and $2{\nu }_2$ of the ${}^{28}$SiD${}_4$ molecule. Numerous “hot” dyad–pentad transitions (in general, 5545 “hot” transitions) were also assigned for the first time in the region of 600–760 cm${}^{-1}$. Rotational, centrifugal distortion, tetrahedral splitting, and interaction parameters for the $(0002,F_2)$, $(0002,E)$, $(0002,A_1)$, $(0101,F_2)$, $(0101,F_1)$, $(0200,A_1)$ and $(0200,E)$ vibrational states were determined from the fit of experimental line positions. The obtained set of 69 fitted parameters reproduces the initial experimental data with an accuracy of $d_{\text{rms}}=3.12\times {10}^{-4}$ cm${}^{-1}$ for the 6490 “cold” transitions and $d_{\text{rms}}=2.33\times {10}^{-4}$ cm${}^{-1}$ for the 5545 “hot” transitions. Results of the analogues analysis for the ${}^{29}$SiD${}_4$ and ${}^{30}$SiD${}_4$ isotopologues with 403/136 “cold” and 171/99 “hot” assigned transitions are presented also.

SiD的红外光谱${}_4$ 在 350-2050 cm 区域测量了自然丰度${}^{-1}$ 使用 Bruker IFS 125HR 傅立叶变换干涉仪，光学分辨率为 0.0021 和 0.0016 cm${}^{-1}$并进行了分析。不少于 6490 次转换$J^{\text{最大限度}}$ = 33 人第一次被分配到乐队 $2{\nu }_4$, ${\nu }_2+{\nu }_4$， 和 $2{\nu }_2$ 的 ${}^{28}$硅酸盐${}_4$分子。在 600-760 cm 范围内还首次分配了许多“热”二元组-五单元组跃迁（通常为 5545 个“热”跃迁）${}^{-1}$. 旋转、离心变形、四面体分裂和相互作用参数$(0002,F_2)$, $(0002,乙)$, $(0002,{\mathrm{一种}}_1)$, $(0101,F_2)$, $(0101,F_1)$, $(0200,{\mathrm{一种}}_1)$ 和 $(0200,乙)$振动状态由实验线位置的拟合确定。获得的 69 个拟合参数集以精度为$d_{\text{均方根}}=3.12\times {10}^{-4}$ 厘米${}^{-1}$ 对于 6490“冷”转换和 $d_{\text{均方根}}=2.33\times {10}^{-4}$ 厘米${}^{-1}$对于 5545 “热”转换。类似物分析的结果${}^{29}$硅酸盐${}_4$ 和 ${}^{30}$硅酸盐${}_4$ 还提供了具有 403/136“冷”和 171/99“热”指定跃迁的同位素体。