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The fluorescence line narrowing (FLN) of the N 1 and N 2 lines of pairs of Cr 3+ ions in concentrated ruby has been studied. The structure of the narrowed lines has been explained and measurements of the homogeneous width have been improved. By use of the FLN and time-resolved spectroscopy, spectral transfer within the N 1 line has been investigated. A two-phonon-assisted process has been found to be responsible for the transfer.
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Monteil et al. (1984) studied this question.
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