Abstract The ν3 band of D3SiF near 890 cm−1 recorded with a resolution of 2.4×10−3 cm−1 has been explored for the 29Si and 30Si isotopic species. Moreover, the ν3+ν6−ν6 and 2ν3−ν3 bands for the main 28Si isotopomer have been assigned. For this purpose the ν3+ν6 and 2ν3 bands at 1435.697 and 1769.531 cm−1 have been studied. Ground state parameters of the 29Si and 30Si species have been determined by merging newly measured MMW frequencies and ground state combination differences. In addition, v3=1 excited state parameters for these species have been obtained. While for the 28Si species the v3=v6=1 state is locally perturbed by levels of the v2+v5=2 polyad, the v3=2 state appears to be unperturbed, its parameters being predictable from those of the v3=1 state. Anharmonicity constants x33=−4.1334 cm−1 and x36=−3.6547 cm−1 have been determined.

中文翻译：

---

D3SiF 的高分辨率红外和毫米波研究：29Si 和 30Si 物种的地面和 v3=1 状态，以及 D328SiF 的 v3=v6=1 和 v3=2 状态

摘要 已对 29Si 和 30Si 同位素物种探索了以 2.4×10-3 cm-1 分辨率记录的 D3SiF ν3 带，在 890 cm-1 附近。此外，主要 28Si 同位素的 ν3+ν6−ν6 和 2ν3−ν3 带已被指定。为此目的，研究了 1435.697 和 1769.531 cm-1 处的 ν3+ν6 和 2ν3 带。29Si 和 30Si 物种的基态参数已通过合并新测量的毫米波频率和基态组合差异来确定。此外，还获得了这些物种的 v3=1 激发态参数。虽然对于 28Si 物种，v3=v6=1 状态被 v2+v5=2 多聚体的水平局部扰动，但 v3=2 状态似乎未受扰动，其参数可从 v3=1 状态的参数中预测。已经确定了非谐常数 x33=-4.1334 cm-1 和 x36=-3.6547 cm-1。