Molecular Hydrogen in Intercloud Medium

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