Water ice formation on interstellar carbon dust: wet HAC (WHAC)

Details Water ice formation on interstellar carbon dust: wet HAC (WHAC) Water ice formation on interstellar carbon dust: wet HAC (WHAC)

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.272..442d&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 272, Issue 2, pp. 442-446.

Astronomy and Astrophysics

Astronomy

10

Molecular Processes-Ism, Clouds-Dust, Extinction-Ism, Molecules

Scientific paper

A quantitative threshold for the radiative conversion of hydrogenated amorphous carbon (HAC) to amorphous carbon (aC) has been identified from laboratory data. This threshold, which can be expressed as a critical ultraviolet exposure _c~=10 J cm^-2, is reached after exposure of dust to the standard interstellar radiation field for ~10^6 yr when A_V^0=2.3 mag. The conversion from HAC to aC involves a change in surface structure, which may inhibit the bonding of gaseous molecules when A_V

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