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Table C.1

Model parameter for silicate and graphite surfaces.

Parameter Silicate Graphite
EH2    [K] a 320 520
μb 0.3 0.4
ES    [K] c 110 260
EHP    [K] d 450 800
EHC    [K] e 30 000 30 000
f 14.4 14.0
νH2    [s-1] g 3 × 1012 3 × 1012
νHC    [s-1] h 1.3 × 1013 1.3 × 1013
F    [mLys-1] i 10-10

Notes. For more details about the determination and calculation of these parameters, see Cazaux & Tielens (2002).

(a)

Desorption energy of H2.

(b)

Fraction of newly formed H2 that stays on the surface.

(c)

Energy of the saddle point between a chemisorbed and a physisorbed site.

(d)

Desorption energy of physisorbed H.

(e)

Desorption energy of chemisorbed H.

(f)

Product of the width and height of the energy barrier between a physisorbed and a chemisorbed site. For more details see Cazaux & Tielens (2004)

(g)

vibrational frequency of H2 in surface sites.

(h)

vibrational frequency of H in surface sites.

(i)

Flux of H atoms in monolayers per second.

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