Extrinsic photoconductivity shadowing (EPS) as a method to study triplet energy migration in molten naphthalene

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Abstract
Temperature dependence around the melting point of the long-range triplet diffusion length in molten naphthalene was measured by a steady state extrinsic photoconductivity shadowing (EPS) method. Photoinjection was shown to be bipolar and its relation to the nonuniform field profile, which is determined by the dark current, was elucidated. The calculated effect of this field profile on a pulse experiment designed to measure triplet lifetime and other kinetic parameters is presented. The EPS method is based on a precisely defined light intensity distribution and derives its accuracy from the ability to determine optical component positions by diffraction techniques.