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Table B.2

Critical densities in the LH formation rate of H2 for amorphous carbon and a mean distance between physisorbed sites of 2.6    Å , where T is the gas temperature in K.

Tgrain   (K) 10 15 30
a = 10-6   cm a = 10-5   cm a = 10-6   cm a = 10-5   cm a = 10-6   cm a = 10-5   cm

[H] a   cm-3
[H] b   cm-3

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