Abstract
We discuss the formation of molecular hydrogen on the surfaces of grains in a hot intercloud medium, by the process of chemisorption of hydrogen atoms on graphite grains. It is suggested that the molecular hydrogen observed towards stars with low reddening, may be located in the intercloud medium towards these stars. A comparison of the observed population distributions of H2 with the theoretical calculations shows that the observations are in the main consistent with a gas kinetic-temperature ∼8000 K and densities about 0.1 to 1 cm−3, parameters which are appropriate to the intercloud phase of the two phase model of the interstellar medium.
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