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Title: Laboratory surface astrochemistry experiments

Abstract

Although several research groups have studied the formation of H{sub 2} on interstellar dust grains using surface science techniques, few have explored the formation of more complex molecules. A small number of these reactions produce molecules that remain on the surface of interstellar dust grains and, over time, lead to the formation of icy mantles. The most abundant of these species within the ice is H{sub 2}O and is of particular interest as the observed molecular abundance cannot be accounted for using gas-phase chemistry alone. This article provides a brief introduction to the astronomical implications and motivations behind this research and the requirement for a new dual atomic beam ultrahigh vacuum (UHV) system. Further details of the apparatus design, characterisation, and calibration of the system are provided along with preliminary data from atomic O and O{sub 2} beam dosing on bare silica substrate and subsequent temperature programmed desorption measurements. The results obtained in this ongoing research may enable more chemically accurate surface formation mechanisms to be deduced for this and other species before simulating the kinetic data under interstellar conditions.

Authors:
; ; ; ;  [1]
  1. Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom)
Publication Date:
OSTI Identifier:
22392514
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 86; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ABUNDANCE; ATOMIC BEAMS; CALIBRATION; CHEMISTRY; COMPLEXES; DESIGN; DESORPTION; DUSTS; EQUIPMENT; MOLECULES; SILICA; SUBSTRATES; SURFACES

Citation Formats

Frankland, V. L., Rosu-Finsen, A., E-mail: ar163@hw.ac.uk, Lasne, J., Collings, M. P., and McCoustra, M. R. S. Laboratory surface astrochemistry experiments. United States: N. p., 2015. Web. doi:10.1063/1.4919657.
Frankland, V. L., Rosu-Finsen, A., E-mail: ar163@hw.ac.uk, Lasne, J., Collings, M. P., & McCoustra, M. R. S. Laboratory surface astrochemistry experiments. United States. doi:10.1063/1.4919657.
Frankland, V. L., Rosu-Finsen, A., E-mail: ar163@hw.ac.uk, Lasne, J., Collings, M. P., and McCoustra, M. R. S. Fri . "Laboratory surface astrochemistry experiments". United States. doi:10.1063/1.4919657.
@article{osti_22392514,
title = {Laboratory surface astrochemistry experiments},
author = {Frankland, V. L. and Rosu-Finsen, A., E-mail: ar163@hw.ac.uk and Lasne, J. and Collings, M. P. and McCoustra, M. R. S.},
abstractNote = {Although several research groups have studied the formation of H{sub 2} on interstellar dust grains using surface science techniques, few have explored the formation of more complex molecules. A small number of these reactions produce molecules that remain on the surface of interstellar dust grains and, over time, lead to the formation of icy mantles. The most abundant of these species within the ice is H{sub 2}O and is of particular interest as the observed molecular abundance cannot be accounted for using gas-phase chemistry alone. This article provides a brief introduction to the astronomical implications and motivations behind this research and the requirement for a new dual atomic beam ultrahigh vacuum (UHV) system. Further details of the apparatus design, characterisation, and calibration of the system are provided along with preliminary data from atomic O and O{sub 2} beam dosing on bare silica substrate and subsequent temperature programmed desorption measurements. The results obtained in this ongoing research may enable more chemically accurate surface formation mechanisms to be deduced for this and other species before simulating the kinetic data under interstellar conditions.},
doi = {10.1063/1.4919657},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 5,
volume = 86,
place = {United States},
year = {2015},
month = {5}
}