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Excitation of the Br2 A 3Π(1u) state by 532 nm radiation was examined in a low temperature (15 K) argon matrix. Fluorescence polarization anisotropies were measured in order to assign the absorption system by which the A state was excited. Previous investigators had suggested that the A state was populated by B→A transfer following absorption by the B–X system. The present study demonstrates unambiguously that the A state is populated by direct A–X absorption.
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Nicolaï et al. (1985) studied this question.
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