Abstract
The fluorescence line narrowing technique is used to study homogenous linewidths of several resonant transitions ( 1D 2 ↔ 3H 4) for the first time. At temperatures exceeding 10 K the linewidths can be fitted by the theory of phonon-induced relaxation. However the narrowest linewidth (10 MHz at 4.5 K) is 16× larger than the width predicted by the theory.
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