Phys. Rev. B 79, 193103 (2009) [4 pages]Second 2s-2p level crossing at the F center in KCl evidenced by frequency upconversion spectroscopyReceived 29 October 2008; revised 21 April 2009; published 13 May 2009 Subpicosecond dynamics of resonant secondary emission from the F center in KCl at 5 K is investigated by frequency upconversion method. Detected photon energy range is from 0.65 to 1.55 eV and covers almost all the stationary emission band. The decay time of the luminescence intensity is longer in the low-energy side of emission band than in the high-energy side. A series of transient luminescence spectra shows relatively high intensities in the low-energy side. These two features indicate the existence of the second 2s-2p level crossing near the relaxed excited state. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.79.193103
DOI:
10.1103/PhysRevB.79.193103
PACS:
78.47.Cd, 61.72.jn, 63.20.kd
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