Fig. 2

Efficiencies for the formation of OH and H2O in low density gas (n = 103 cm-3), in atomic and molecular hydrogen dominated gas. UV fields ranging from G0 = 1 to 1000 are considered. Results from rate equations are shown by a solid and a dotted line for OH and H2O, respectively. The analytical fit is shown by the crosses (OH) and diamonds (H2O).
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