Formation of OH can occur by inverse predissociation from continuum levels to the V = 1, k = I level of the A 2 + state. A rate constant of 1-3 X 10-20 cm3 1 is calculated for temperatures greater than 20 K. Predicted OH densities are consistent with observations in dense, heavily obscured clouds but appear to be somewhat low for H I clouds.
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Julienne et al. (1971) studied this question.
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