From clouds to protoplanetary disks: the astrochemical link

4-8 October 2015
Hans Harnack Haus
Europe/Berlin timezone
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Contribution Review talk

Hans Harnack Haus -
FROM DENSE CORES TO PROTOSTARS 2

Deuterium chemistry and nuclear spin conversion on grain surfaces: implication to deuterium enrichment

Speakers

• Prof. Naoki WATANABE

Content

Water and some organic molecules were found to be deuterium enriched not only toward various astronomical targets and but also in comets and meteorites. Understanding the formation processes of deuterated species may lead to know how and when those molecules are created. Although gas phase chemistry is certainly important for deuterium enrichment, the role of physicochemical processes on the grain surfaces should be also considered. In fact, the extreme deuterium enrichment of formaldehyde and methanol requires the grain-surface process. In this context, we have performed a series of experiments on the formation of deuterated species of water, formaldehyde, methanol, ethanol, ethylene, ethane, methylamine, glycine, and etc. From the results of these experiments and related works, I will discuss the key processes for the deuterium enrichment on grains. In addition, the overview will be presented for the experiments of nuclear spin conversion on grains of which H${2}$ is closely related the formation of H${2}$D$^{+}$ in the gas phase.