Abstract
(1) In order to make the OH absorption bands applicable to a quantitative chemical test for free OH their probability of transition (f value) was measured by the concentration of ``dispersion electrons'' in a known concentration of OH. (2) This concentration of OH is produced by water vapor dissociated at 1473°C, the equilibrium of which was computed. (3) The concentration of the ``dispersion electrons'' was measured by photometry of the absorption lines photographed with high resolving power. (4) The f values of the various absorption lines are given in a table. The most intense lines have f values of the order of magnitude 2×10—4. The accuracy is estimated to be 15 percent, the sensitivity (smallest detectable pressure under the conditions of the present experiment) 0.01 mm. (5) Comparison with other f values leads to the conclusion that the OH absorption band belongs to a half-forbidden transition. The lifetime of the excited state is computed as approximately 4×10—6 sec.
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