Direct laser excitation of the forbidden 684 nm transition in Sm:SrF2 yields a 12.4 ms excited-state lifetime, the longest reported for an optical transition in a solid.
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Direct observation of a highly forbidden optical transition in Sm:SrF$_2$
Direct laser excitation of the forbidden 684 nm transition in Sm:SrF2 yields a 12.4 ms excited-state lifetime, the longest reported for an optical transition in a solid.