Journal
ASTROPHYSICAL JOURNAL
Volume 645, Issue 1, Pages 314-323Publisher
IOP PUBLISHING LTD
DOI: 10.1086/502624
Keywords
ISM : molecules; molecular processes
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We present an analysis of ``bistability'' in gas-phase chemical models of dark interstellar clouds. We identify the chemical mechanisms that allow high- and low-ionization solutions to the chemical rate equations to coexist. We derive simple analytic scaling relations for the gas densities and ionization rates for which the chemistry becomes bistable. We explain why bistability is sensitive to the H-3(+) dissociative recombination rate coefficient and why it is damped by gas-grain neutralization.
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