Deuterium enrichment of ammonia produced by surface N+H/D addition reactions at low temperature
- Creators
- Fedoseev, G.
- Ioppolo, S.
- Linnartz, H.
Abstract
The surface formation of NH3 and its deuterated isotopologues – NH_2D, NHD_2, and ND_3 – is investigated at low temperatures through the simultaneous addition of hydrogen and deuterium atoms to nitrogen atoms in CO-rich interstellar ice analogues. The formation of all four ammonia isotopologues is only observed up to 15 K, and drops below the detection limit for higher temperatures. Differences between hydrogenation and deuteration yields result in a clear deviation from a statistical distribution in favour of deuterium enriched species. The data analysis suggests that this is due to a higher sticking probability of D atoms to the cold surface, a property that may generally apply to molecules that are formed in low temperature surface reactions. The results found here are used to interpret ammonia–deuterium fractionation as observed in pre-protostellar cores.
Additional Information
© 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2014 September 5. Received 2014 September 5; in original form 2014 July 2. First published online November 12, 2014. We are grateful to Herma Cuppen (Nijmegen) for fruitful discussions during the preparation of the manuscript. This research was funded by the European Community's Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 238258 (LASSIE), the Netherlands Research School for Astronomy (NOVA), Netherlands Organization for Scientific Research (NWO) through a VICI grant and the European Research Council (ERC-2010-StG, grant agreement no. 259510-KISLMOL). Support for SI from the Niels Stensen Fellowship and the Marie Curie Fellowship (FP7-PEOPLE-2011-IOF-300957) is gratefully acknowledged.Attached Files
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Additional details
- Eprint ID
- 55623
- Resolver ID
- CaltechAUTHORS:20150309-084310234
- 238258
- European Community Seventh Framework Programme (FP7/2007-2013)
- Netherlands Research School for Astronomy (NOVA)
- Netherlands Organization for Scientific Research (NWO) VICI Grant
- 259510-KISLMOL
- European Research Council (ERC-2010-StG)
- Niels Stensen Fellowship
- FP7-PEOPLE-2011-IOF-300957
- Marie Curie Fellowship
- Created
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2015-03-10Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field