星际介质中的表面化学--用Langmuir-Hinshelwood和Eley-Rideal机制形成I - H2
Surface chemistry in the interstellar medium - I - H2 formation by Langmuir-Hinshelwood and Eley-Rideal mechanisms
摘要：
H2的形成仍然是理解星际物理学的一个主要问题。我们根据最新的实验和理论数据研究了H2在星际介质中的形成。我们在Meudon PDR代码中实现了颗粒表面上的详细H2形成机制：i）考虑到扩散过程中不同尺寸的尘埃颗粒的贡献的Langmuir-Hinshelwood机制和ii）Eley-Rideal机制。我们表明，由于这些过程，即使在尘埃温度大于25 K的区域也可以形成H2。我们还表明，形成的Eley-Rideal机制可以是一个重要的来源加热的气体。我们推导出各种天体物理条件下的谱线强度。与通过在UV中的吸收的观察确定的标准形成相比，这种方法导致增强的H2形成速率。我们推导出一些等压和等容模型的H2线强度。
英文摘要：
H2 formation remains a major issue for the understanding of interstellar physics. We investigate H2 formation in the interstellar medium at the light of the most recent experimental and theoretical data. We implemented detailed H2 formation mechanisms on grains surface in the Meudon PDR code : i) Langmuir-Hinshelwood mechanism taking into account the contribution of the different sizes of dust grains in the diffusion processes and ii) the Eley-Rideal mechanism. We show that, thanks to these processes, H2 can be formed even in regions where dust temperature is larger than 25 K. We also show that formation by Eley-Rideal mechanism can be a significant source of heating of the gas. We derive line intensities for various astrophysical conditions. Such an approach results in an enhanced H2 formation rate compared to the standard formation determined by observations in absorption in the UV. We derive some H2 line intensities for isobaric and isochoric models.
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