The theory of forbidden rotational transitions is reviewed and spontaneous emission rates and lifetimes of metastable levels of NH₃, H₃O⁺, H₃⁺, and CH₃CN are calculated. Rotational levels are classified into stable, metastable, and unstable levels. The importance of the forbidden rotational transitions in the thermalization of interstellar molecules is discussed.

中文翻译：

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禁止的旋转过渡和天体物理学

回顾了禁止旋转跃迁的理论，计算了NH ₃、H ₃ O ⁺、H ₃ ⁺和CH ₃ CN亚稳态能级的自发发射率和寿命。旋转水平分为稳定水平、亚稳定水平和不稳定水平。讨论了禁止旋转跃迁在星际分子热化中的重要性。