Extrapolating from extensive field measurements on foliar emissions in the U. S. we arrive at approximate global inputs of isoprene and terpenes of 3.5 × 1014 and 4.8 × 1014 g(C)/yr respectively. The oxidation of these hydrocarbons could contribute in an important way to the atmospheric sources of CO (4.2− 13.3 × 1014g/yr)and H2 (10 − 35 × 1012g/yr), and to organic species soluble in rainwater.

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The apparatus for observing triplet-triplet transitions in polyatomic molecules is the same as in part I except that resonance lamps are here replaced by a flash lamp. Triplet-triplet spectra are reported for benzophenone, acetophenone, β-bromo and β-iodo naphthalene. No triplet-triplet absorption was found in benzene, biacetyl, acetone dibromo benzene, or diisopropyl ketone. Detailed studies of the energy levels of benzophenone and acetophenone are reported.

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