Theoretical rate constants among the lowest 45 para and 45 ortho rotational levels of water in collisions with He atoms have been calculated for temperatures between 20 and 2000 K using a recently improved theoretical interaction potential. These values are about 30%-40% larger than those reported previously (Palma et al. 1988b) but relative sizes of different state-to-state rates have not changed significantly. Successive improvements to the theoretical description of this system now appear to have converged.

中文翻译：

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改善星际水的碰撞激发率。

使用最近改进的理论相互作用势，已经计算出在20至2000 K之间的温度下，与He原子碰撞时水的最低45个对位和45个正向旋转能级中的理论速率常数。这些值比以前报道的值大30％-40％（Palma等，1988b），但是不同州与州之间比率的相对大小没有显着变化。现在似乎已经对该系统的理论描述进行了逐步改进。