Abstract
AbstractAbsolute collision frequencies were obtained for the loss of internal energy of an energetically defined isolated molecule. These values are an order of magnitude less than predicted from the kinetic theory of gases. Measurements were made by a differential comparison of the lifetime of isolated molecules with that in the presence of an inert gas. The lifetime spectrum gives absolute rate constants in the excited state, the differential spectrum gives energy transfer information. Measurements were made continuously over a broad range of wavelengths involving the first two excited states of β‐naphthylamine.
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