The formation of H2 by H-atom reaction with grain surfaces
The formation of H2 by H-atom reaction with grain surfaces
复制标题
H原子与颗粒表面反应形成H2
DOI：
10.1093/mnras/279.2.591
复制
发表时间：
1996
影响因子：
4.8
通讯作者：
W. Duley
中科院分区：
文献类型：
--
作者：
W. Duley
提出了氢原子与碳质颗粒表面反应生成氢的模型。这种反应涉及在低晶粒温度下的间隙H原子和在较高温度下与-CH、-CH 2和-CH 3基团键合的H原子，在H原子与晶粒表面碰撞时迅速发生。氢的生成速率和反应效率取决于气体动力学和粉尘温度。利用该反应模型（PRM）计算出的H2生成速率系数R（cm 3 s −1）可以从实验室数据中计算出来，并且与R的测量值一致。在星际云中，Ron对环境条件的依赖性可以很容易地从这个非平衡反应模型中估算出来，发现Ron对气体动力学温度Tk有很强的依赖性，当Tk ≈ 300 K时，即使对于温暖的尘埃，Ron也可以超过10− 17 cm 3 s −1。
A model for H2formation by reaction of H-atoms with the surface of carbonaceous grains is developed. Such reactions, which involve interstitial H-atoms at low grain temperature and H-atoms bonded to -CH, -CH2and -CH3groups at higher temperature, occur promptly on the collision of an H-atom with a grain surface. The rate of hydrogen formation and the efficiency of reaction depend on both gas kinetic and dust temperature. The rate coefficientR(cm3s−1) for H2formation using this prompt-reaction model (PRM) can be calculated from laboratory data and is consistent with measured values ofR. The dependence ofRon ambient conditions in interstellar clouds can be easily estimated from this prompt-reaction model.Ris found to be strongly dependent on gas kinetic temperatureTkand can exceed 10−17cm3s−1, even for warm dust, whenTk≿300 K.