Non-thermal chemical reaction involving atom tunneling on interstellar grains is one of the most important processes for chemical evolution in molecular clouds. Methanol (CH3OH) is known as not only abundant molecule in interstellar medium (ISM) but also a starting material of complex organic molecules. Therefore, many groups have studied its formation process theoretically and experimentally. The successive CO hydrogenation via H2CO formation by tunneling on a grain is now well understood as the formation process of CH3OH. Recently, Chuang et al. (2016) claimed that the backward processes such as CH3OH → H2CO and H2CO → CO by H abstraction reactions were observed at co-deposition of CH3OH (or H2CO) and H atoms. In the present study, we conducted experiments of the H abstraction reaction of CH3OH by H atoms exposure with two different ices, pure solid CH3OH and CH3OH on amorphous solid water, as more realistic ice grain analogues. We will discuss the phenomena which are triggered by H atoms exposure of CH3OH.

Reaction experiments on H exposure of solid methanol at low temperatures

255th National Meeting (2018)

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