Development of an analysis equipment for detecting trace adsorbate molecules on amorphous solid water by reactive ion scattering method
Abstract
\quad Chemical reactions on interstellar icy grain surfaces have been studied for understanding chemical evolution in space. In a low temperature region ($\sim$10K), chemical reactions at icy grain surfaces would be mainly driven with H atoms, because particles heavier than H atom hardly diffuse to encounter reaction partners on amorphous solid water (ASW), which is considered as surface material of grains. After being placed those grains in warm circumstances (<100K) with progress of a star formation, many molecules and radicals on the grain surfaces come to diffuse. At this stage, formations of large molecules by radical-radical or radical-molecule reactions on the surface would be expected. Although those radical related chemical reactions on the grain surface are very important research subjects, the details of those have not been reported in experimental works. This is because the detections of radicals with conventional methods such as infrared absorption and temperature programmed desorption are difficult. \quad Recently, we developed an analysis equipment for detecting trace adsorbate molecules by reactive ion scattering method using a Cesium ion beam. This analysis equipment has higher sensitivity than the infrared absorption method and does not need any temperature ramping of substrate. In the presentation, this equipment and some results of preliminary experiments will be introduced for details.
- Publication:
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43rd COSPAR Scientific Assembly. Held 28 January - 4 February
- Pub Date:
- January 2021
- Bibcode:
- 2021cosp...43E1995H