H2 Formation on Interstellar Grains in Different Physical Regimes

Details H2 Formation on Interstellar Grains in Different Physical Regimes H2 Formation on Interstellar Grains in Different Physical Regimes

1998-07-14

arxiv.org/abs/astro-ph/9807133v1

Mon. Not. R. Astron. Soc, Vol. 296, 869 (1998)

Astronomy and Astrophysics

Astrophysics

4 pages, MN style

Scientific paper

10.1046/j.1365-8711.1998.01427.x

An analysis of the kinetics of H2 formation on interstellar dust grains is presented using rate equations. It is shown that semi-empirical expressions that appeared in the literature represent two different physical regimes. In particular, it is shown that the expression given by Hollenbach, Werner and Salpeter [ApJ, 163, 165 (1971)] applies when high flux, or high mobility, of H atoms on the surface of a grain, makes it very unlikely that H atoms evaporate before they meet each other and recombine. The expression of Pirronello et al.\ [ApJ, 483, L131 (1997)] -- deduced on the basis of accurate measurements on realistic dust analogue -- applies to the opposite regime (low coverage and low mobility). The implications of this analysis for the understanding of the processes dominating in the Interstellar Medium are discussed.

Affiliated with

Also associated with

No associations

Rating

H2 Formation on Interstellar Grains in Different Physical Regimes 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 H2 Formation on Interstellar Grains in Different Physical Regimes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and H2 Formation on Interstellar Grains in Different Physical Regimes will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-562867