Blake, Geoffrey A. (1988) Chemistry in Dense Molecular Clouds: Theory and Observational Constraints. In: Molecular Clouds in the Milky Way and External Galaxies. Lecture notes in physics . No.315. Springer-Verlag , New York, pp. 132-150. ISBN 9780387504384 http://resolver.caltech.edu/CaltechAUTHORS:20120918-102107186
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For the most part, gas phase models of the chemistry of dense molecular clouds predict the abundances of simple species rather well. However, for larger molecules and even for small systems rich in carbon these models often fail spectacularly. We present a brief review of the basic assumptions and results of large scale modeling of the chemistry in dense molecular clouds. Particular attention will be paid to the influence of the gas phase ratios of the major elements in molecular clouds, and the likely role grains play in maintaining these ratios as clouds evolve from initially diffuse objects to denser cores with associated stellar and planetary formation. Recent spectral line surveys at centimeter and millimeter wavelengths along with selected observations in the submillimeter have now produced an accurate "inventory" of the gas phase elemental budgets in different types of molecular clouds, though gaps in our knowledge clearly remain. The constraints these observations place on theoretical models of interstellar chemistry can be used to gain insights into why the models fail, and show also which neglected processes must be included in more complete analyses. Looking toward the future, truly protostellar regions are only now becoming available for both experimental and theoretical study, and some of the expected modifications of molecular cloud chemistry in these sources are therefore outlined.
|Item Type:||Book Section|
|Additional Information:||© 1988 Springer-Verlag.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||19 Sep 2012 18:40|
|Last Modified:||26 Dec 2012 16:12|
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