Other
Scientific paper
Nov 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ijmsi.149..231s&link_type=abstract
International Journal of Mass Spectrometry and Ion Processes, Vol. 149 - 150, p. 231 - 249
Other
5
Interstellar Clouds: Chemistry
Scientific paper
Recent experiments at temperatures down to 13K have revealed that the rate constants for many reactions between electrically neutral species involving free radicals increase as the temperature falls, attaining their maximum value below 50K. This behaviour demonstrates that there is no potential energy barrier to these reactions, rather it is "capture" of the reagents by the attractive potential acting between them which determines whether reaction occurs. Examples of different categories of reaction, in which radicals react with other radicals, with unsaturated molecules, and with saturated molecules, are discussed, and parallels are drawn with the dynamics of ion/molecule reactions. The realisation that many neutral/neutral reactions are rapid at such low temperatures is likely to have a profound effect on chemical models of dense interstellar clouds and some of these implications are briefly discussed.
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