Abstract
Molecule production and excitation of H<SUB>2</SUB> are studied for MHD shock waves propagating into diffuse molecular gas. Extensive calculations are carried out for a preshock density n<SUB>H</SUB> = 50 cm<SUP>-3</SUP> and for 0.5 ≤ H<SUB>2</SUB>/H ≤ 5. CH<SUP>+</SUP> column densities in excess of 10<SUP>13</SUP>cm<SUP>-2</SUP> can be produced by shocks with v<SUB>s</SUB> > 9 km s<SUP>-1</SUP>; OH and CH are also produced in these shocks. The production of other species - in particular, CO, HCO<SUP>+</SUP>, CH<SUB>2</SUB><SUP>+</SUP>, and CH<SUB>3</SUB><SUP>+</SUP> - is discussed, and column densities of rotationally excited H<SUB>2</SUB> are computed. Specific shock models are proposed for the lines of sight to ζ Per, ο Per, and χ Oph, and the models are compared to available observations.
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