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H2, HD, and D2abundances on ice-covered dust grains in dark clouds
Astronomy and Astrophysics
Aims. We seek to study the abundances of H 2 , HD, and D 2 adsorbed onto ice-covered dust grains in dark molecular clouds in the interstellar medium. Methods. We use our previously developed detailed model describing temperature-programmed desorption (TPD) experiments of H 2 and its isotopologues on water ice. We here extrapolate these model results from laboratory conditions to conditions similar to those found in dark molecular clouds. Results. By means of our model we are able to infer threedoi:10.1051/0004-6361/200912124 fatcat:5i6ruzkgrbartlp5ejgaevugq4