The Fourier transform infrared spectrum of SF6 was recorded in a supersonic expansion jet of an SF6/argon mixture. The SF6:Ar seeding ratio was 2:3. The instrumental bandwidth was 0.005 cm-1. A globar source and an MCT detector were used. A rotational temperature of approximately 30 K was achieved. The nu2 + nu6 combination band of 32SF6 was analyzed using a modified version of the spherical top data system (STDS) programs developed in Dijon. A very good fit was obtained for this band with an rms of 0.0036 cm-1. The effective Hamiltonian was developed up to fourth order for the nu2 + nu6 part, to second order for the nu2 and ground state parts, and to first order for the nu6 part. Five hundred twenty-one transitions were assigned, 40 of them reaching the F2u forbidden sublevel. The positions of the two F1u and F2u sublevels are found to be 991.276 and 989.487 cm-1, respectively. The nu3 band of the 33SF6 and 34SF6 isotopomers were also analyzed. Parameters and simulations are presented. A first detection of the nu3 Q branch of 36SF6 (0.02% natural abundance) is reported. Copyright 1998 Academic Press.

中文翻译：

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SF6 的高分辨率射流冷却光谱：32SF6 的 ν2+ ν6 组合带和稀有同位素的 ν3 带

SF6 的傅立叶变换红外光谱是在 SF6/氩气混合物的超音速膨胀射流中记录的。SF6:Ar 晶种比为 2:3。仪器带宽为 0.005 cm-1。使用了全局光源和 MCT 检测器。达到了大约 30 K 的旋转温度。使用第戎开发的球顶数据系统 (STDS) 程序的修改版本分析了 32SF6 的 nu2 + nu6 组合带。该频带的 rms 为 0.0036 cm-1，非常适合。对 nu2 + nu6 部分的有效哈密顿量发展到四阶，对 nu2 和基态部分发展到二阶，对 nu6 部分发展到一阶。分配了 521 个转换，其中 40 个到达了 F2u 禁止子级别。发现两个 F1u 和 F2u 子级别的位置为 991。分别为 276 和 989.487 cm-1。还分析了 33SF6 和 34SF6 同位素的 nu3 带。给出了参数和模拟。报告了 36SF6（0.02% 自然丰度）的 nu3 Q 分支的首次检测。版权所有 1998 学术出版社。