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Aspects of Physical Chemistry Read chapter Read first chapter

2013 | OriginalPaper | Chapter

3. Chemical Processes in the Interstellar Medium

Author : Michael J. Pilling

Published in: Astrochemistry and Astrobiology

Publisher: Springer Berlin Heidelberg

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Abstract

Models of the chemical composition of the interstellar medium incorporate networks of chemical reactions. The rate coefficients and the products of these reactions are important components of the model. In this chapter I review the determinants of these components and the methods used to measure them experimentally and calculate them using theory. The bulk of the chapter is devoted to ion + neutral molecule and neutral molecule + neutral molecule reactions. I also briefly discuss radiative association, dissociative recombination and reactions occurring on surfaces. The conditions of low pressure and low temperature in the interstellar medium place considerable demands on experiment and theory, which are particularly severe for reactions between neutral species. Many reactions can be estimated with tolerable accuracy. Others require a combination of high level electronic structure calculations, coupled with detailed theory and low temperature experimental measurements.

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previous chapter The Molecular Universe
next chapter Astrochemistry: Synthesis and Modelling
Footnotes
1
These definitions of ‘branching ratio’ and ‘channel efficiency’ are not universally agreed. For example, the KIDA data base uses ‘branching ration’ for the ratio of the rate coefficient for a particular channel to that for the overall reaction, so that the branching ratios sum to unity.
 
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Metadata
Title
Chemical Processes in the Interstellar Medium
Author
Michael J. Pilling
Copyright Year
2013
Publisher
Springer Berlin Heidelberg
Book
Astrochemistry and Astrobiology

Print ISBN: 978-3-642-31729-3

Electronic ISBN: 978-3-642-31730-9

Copyright Year: 2013

DOI
https://doi.org/10.1007/978-3-642-31730-9_3

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