Effective rate coefficients for molecular hydrogen formation in diffuse interstellar clouds

Details Effective rate coefficients for molecular hydrogen formation in diffuse interstellar clouds Effective rate coefficients for molecular hydrogen formation in diffuse interstellar clouds

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...458..497c&link_type=abstract

Astronomy and Astrophysics, Volume 458, Issue 2, November I 2006, pp.497-505

Astronomy and Astrophysics

Astrophysics

4

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

Scientific paper

Aims.A method to determine effective rate coefficients for H{2} formation on grain surfaces is proposed based on the continuous-time, random-walk Monte Carlo simulation. Methods: .Our Monte Carlo simulation is used to calculate the efficiency of molecular hydrogen formation via recombination of H atoms on flat and rough surfaces of olivine and amorphous carbon under a variety of diffuse cloud conditions. The results are then fitted to two types of rate laws to determine effective rate coefficients for use in rate equation treatments. These rate coefficients can be utilized in pure gas-phase models, where the rate of molecular formation is associated with a grain collision rate for H atoms multiplied by an efficiency factor, and in gas-grain models, where the actual diffusion of H atoms on a grain surface is considered. Results: .The effective rate coefficients are tabulated as a function of incoming atomic hydrogen flux and surface temperature, over temperature ranges for which the surfaces show a reasonable efficiency of molecular hydrogen formation. For the flat surfaces studied, corrections to the standard rate treatment do not exceed a factor of three.

Affiliated with

Also associated with

No associations

Rating

Effective rate coefficients for molecular hydrogen formation in diffuse interstellar clouds 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 Effective rate coefficients for molecular hydrogen formation in diffuse interstellar clouds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Effective rate coefficients for molecular hydrogen formation in diffuse interstellar clouds will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1309828