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seen Nov 23 '13 at 16:16

Jul
23
comment Mean free path of UV photon
The absorber is another H2 molecules and dust particles (you can assume that the dust density scales with the gas density and is proportional to the metallicity of the gas).
Jul
23
comment Mean free path of UV photon
Thanks, but the problem here is where to find the absorption cross section of UV photons, better as a function of wavelength.
Jul
19
comment Mean free path of UV photon
By density I mean atoms per volume and the photons are only absorbed by the medium
Jul
19
comment Mean free path of UV photon
It's an expression of the cross section that I would like to find out. The problem is computing the mean free path of UV photons in a molecular cloud where dust and H2 are responsible for absorption. You can also assume that the dust density is proportional to the metallicity of the gas.
Jul
19
awarded  Student
Jul
19
asked Mean free path of UV photon