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Atoms 2017, 5(4), 46; doi:10.3390/atoms5040046

Rosetta Mission: Electron Scattering Cross Sections—Data Needs and Coverage in BEAMDB Database

1
Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, Belgrade 11080, Serbia
2
Institute for Applied and Physical Chemistry, Fachbereich 2 (Biologie/Chemie), Universität Bremen, Leobener Straße 5, Bremen 28359, Germany
3
Astronomical Observatory Belgrade, Volgina 7, Belgrade 11000, Serbia
4
Department of Physical Sciences, The Open University, Milton Keynes MK7 6AA, UK
*
Author to whom correspondence should be addressed.
Received: 21 September 2017 / Revised: 13 November 2017 / Accepted: 14 November 2017 / Published: 17 November 2017
(This article belongs to the Special Issue Spectral Line Shapes in Astrophysics and Related Topics)
View Full-Text   |   Download PDF [5446 KB, uploaded 17 November 2017]   |  

Abstract

The emission of [O I] lines in the coma of Comet 67P/Churyumov-Gerasimenko during the Rosetta mission have been explained by electron impact dissociation of water rather than the process of photodissociation. This is the direct evidence for the role of electron induced processing has been seen on such a body. Analysis of other emission features is handicapped by a lack of detailed knowledge of electron impact cross sections which highlights the need for a broad range of electron scattering data from the molecular systems detected on the comet. In this paper, we present an overview of the needs for electron scattering data relevant for the understanding of observations in coma, the tenuous atmosphere and on the surface of 67P/Churyumov-Gerasimenko during the Rosetta mission. The relevant observations for elucidating the role of electrons come from optical spectra, particle analysis using the ion and electron sensors and mass spectrometry measurements. To model these processes electron impact data should be collated and reviewed in an electron scattering database and an example is given in the BEAMD, which is a part of a larger consortium of Virtual Atomic and Molecular Data Centre—VAMDC. View Full-Text
Keywords: electron scattering; cross sections; Rosetta mission; atomic and molecular databases electron scattering; cross sections; Rosetta mission; atomic and molecular databases
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Marinković, B.P.; Bredehöft, J.H.; Vujčić, V.; Jevremović, D.; Mason, N.J. Rosetta Mission: Electron Scattering Cross Sections—Data Needs and Coverage in BEAMDB Database. Atoms 2017, 5, 46.

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