Laboratory synthesis of molecular hydrogen on surfaces of astrophysical interest

V. Pirronello; Chi Liu; Liyong Shen; Gianfranco Vidali

doi:10.1086/310464

Laboratory synthesis of molecular hydrogen on surfaces of astrophysical interest

V. Pirronello, Chi Liu, Liyong Shen, Gianfranco Vidali

Department of Physics

Research output: Contribution to journal › Article › peer-review

157 Scopus citations

Abstract

We report on the first results of experiments to measure the recombination rate of hydrogen on surfaces of astrophysical interest. Our measurements give lower values for the recombination efficiency (sticking probability S times the probability of recombination upon H-H encounter, γ) than model-based estimates. We propose that our results can be reconciled with average estimates of the recombination rate [(1/2)n_Hn_gv_H ASγ from astronomical observations, if the actual surface of an average grain is rougher, and its area bigger, than the one considered in models.

Original language	English (US)
Pages (from-to)	L69-L72
Journal	Astrophysical Journal
Volume	475
Issue number	1 PART II
DOIs	https://doi.org/10.1086/310464
State	Published - 1997

Keywords

Dust, extinction
ISM: abundances
ISM: molecules
Molecular processes

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/310464

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title = "Laboratory synthesis of molecular hydrogen on surfaces of astrophysical interest",

abstract = "We report on the first results of experiments to measure the recombination rate of hydrogen on surfaces of astrophysical interest. Our measurements give lower values for the recombination efficiency (sticking probability S times the probability of recombination upon H-H encounter, γ) than model-based estimates. We propose that our results can be reconciled with average estimates of the recombination rate [(1/2)nHngvH ASγ from astronomical observations, if the actual surface of an average grain is rougher, and its area bigger, than the one considered in models.",

keywords = "Dust, extinction, ISM: abundances, ISM: molecules, Molecular processes",

author = "V. Pirronello and Chi Liu and Liyong Shen and Gianfranco Vidali",

year = "1997",

doi = "10.1086/310464",

language = "English (US)",

volume = "475",

pages = "L69--L72",

journal = "Astrophysical Journal",

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TY - JOUR

T1 - Laboratory synthesis of molecular hydrogen on surfaces of astrophysical interest

AU - Pirronello, V.

AU - Liu, Chi

AU - Shen, Liyong

AU - Vidali, Gianfranco

PY - 1997

Y1 - 1997

N2 - We report on the first results of experiments to measure the recombination rate of hydrogen on surfaces of astrophysical interest. Our measurements give lower values for the recombination efficiency (sticking probability S times the probability of recombination upon H-H encounter, γ) than model-based estimates. We propose that our results can be reconciled with average estimates of the recombination rate [(1/2)nHngvH ASγ from astronomical observations, if the actual surface of an average grain is rougher, and its area bigger, than the one considered in models.

AB - We report on the first results of experiments to measure the recombination rate of hydrogen on surfaces of astrophysical interest. Our measurements give lower values for the recombination efficiency (sticking probability S times the probability of recombination upon H-H encounter, γ) than model-based estimates. We propose that our results can be reconciled with average estimates of the recombination rate [(1/2)nHngvH ASγ from astronomical observations, if the actual surface of an average grain is rougher, and its area bigger, than the one considered in models.

KW - Dust, extinction

KW - ISM: abundances

KW - ISM: molecules

KW - Molecular processes

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DO - 10.1086/310464

M3 - Article

AN - SCOPUS:0012832051

SN - 0004-637X

VL - 475

SP - L69-L72

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 PART II

ER -

Laboratory synthesis of molecular hydrogen on surfaces of astrophysical interest

Abstract

Keywords

ASJC Scopus subject areas

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