The objective of this work is to derive approximate rovibrational selection rules for the interaction-induced molecular absorption in dipole-less polyatomic molecules. Taking a combination ${\nu }_2$+${\nu }_3$ band in CO${}_2$ molecule as an example, we show that selection rules $\Delta J=\pm 1$ are allowed in collision-induced absorption (CIA) along with conventional selection rules $\Delta J=0,\pm 2$ characteristic for CIA in homonuclear diatomics. The basis of that condition relates to the combined effect of the anisotropy of an external electric perturbation and the anharmonicity of the vibrations.

中文翻译：

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常规线性振动选择规则对对称线性分子中场或碰撞诱导吸收的分解

这项工作的目的是为无偶极多原子分子中的相互作用诱导的分子吸收推导近似的振动选择规则。结合起来${\nu }_2$+${\nu }_3$ CO乐队${}_2$ 以分子为例，我们展示选择规则 $\Delta Ĵ=\pm \mathrm{1个}$ 允许与常规选择规则一起用于碰撞诱导吸收（CIA） $\Delta Ĵ=0，\pm 2$CIA在同核双原子分子中的特征。该条件的基础涉及外部电扰动的各向异性和振动的非谐性的综合作用。