The formation of H_2 by H-atom reaction with grain surfaces

Details The formation of H_2 by H-atom reaction with grain surfaces The formation of H_2 by H-atom reaction with grain surfaces

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.279..591d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 279, Issue 2, pp. 591-594.

Astronomy and Astrophysics

Astronomy

25

Molecular Processes, Ism: Abundances, Dust, Extinction, Ism: Molecules

Scientific paper

A model for H_2 formation by reaction of H-atoms with the surface of carbonaceous grains is developed. Such reactions, which involve interstitial H-atoms at low grain temperature and H-atoms bonded to -CH, -CH_2 and -CH_3 groups at higher temperature, occur promptly on the collision of an H-atom with a grain surface. The rate of hydrogen formation and the efficiency of reaction depend on both gas kinetic and dust temperature. The rate coefficient R (cm^3 s^-1) for H_2 formation using this prompt-reaction model (PRM) can be calculated from laboratory data and is consistent with measured values of R. The dependence of R on ambient conditions in interstellar clouds can be easily estimated from this prompt-reaction model. R is found to be strongly dependent on gas kinetic temperature T_k and can exceed 10^-17 cm^3 s^-1, even for warm dust, when T_k>~300 K.

Affiliated with

Also associated with

No associations

Rating

The formation of H_2 by H-atom reaction with grain surfaces does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The formation of H_2 by H-atom reaction with grain surfaces, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The formation of H_2 by H-atom reaction with grain surfaces will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1615820