The temperature dependences of some types of gaseous ionic reactions of astrochemical interest.

Details The temperature dependences of some types of gaseous ionic reactions of astrochemical interest. The temperature dependences of some types of gaseous ionic reactions of astrochemical interest.

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975orli....6..377m&link_type=abstract

Origins of Life, Volume 6, Issue 3, pp.377-393

Astronomy and Astrophysics

Astronomy

3

Scientific paper

The rate constants of ion-molecule reactions which are of potential significance in astrochemical systems are found to exhibit significant, and in many cases, negative temperature dependences. The rate constants of fast ion-polar molecule reactions (e.g., XH++B»BH++X) may increase by a factor of 5 10 between 1000 and 10K. Slow reactions that proceed via reaction complexes (e.g., H-transfer and association reactions) often exhibit temperature dependences of the formk=AT -n ,n=1 5. Both transition state theory considerations and the coupled-oscillator RRK-type model are seen to be able to account qualitatively for the behavior of slow ion-molecule, reactions.

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