一些具有天体化学意义的气态离子反应的温度依赖性。

The temperature dependences of some types of gaseous ionic reactions of astrochemical interest.

作者信息

Meot-Ner M, Field F H

出版信息

Orig Life. 1975 Jul;6(3):377-93. doi: 10.1007/BF01130339.

Abstract

The rate constants of ion-molecule reactions which are of potential significance in astrochemical systems are found to exhibit significant, and in many cases, negative temperature dependences. The rate constants of fast ion-polar molecule reactions (e.g., XH+ + B leads to BH+ + X) may increase by a factor of 5-10 between 1000 and 10D. Slow reactions that proceed via reaction complexes (e.g., H- transfer and association reactions) often exhibit temperature dependences of the form k = AT-n, n = 1-5. Both transition state theory considerations and the coupled-oscillator RRK-type model are seen to be able to account qualitatively for the behavior of slow ion-molecule reactions.

摘要

在天体化学系统中具有潜在重要性的离子-分子反应速率常数被发现呈现出显著的，并且在许多情况下为负的温度依赖性。快速离子-极性分子反应（例如，XH⁺ + B → BH⁺ + X）的速率常数在1000K和10K之间可能会增大5到10倍。通过反应复合物进行的缓慢反应（例如，H⁻转移和缔合反应）通常呈现出k = AT⁻ⁿ形式的温度依赖性，n = 1 - 5。过渡态理论考量和耦合振荡器RRK型模型都被认为能够定性地解释缓慢离子-分子反应的行为。