Top. Surface abundance of H2, HD, and D2 as a function of temperature for a gas density of 105 cm-3 (full lines). We express the surface abundance both in terms of ML but also surface number density for a grain with radius 0.1 μm. For comparison we show the results of Govers et al. (1980) for H2 and HD (dashed lines). Bottom. Fractional abundances of HD and D2 with respect to H2 on the surface.
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