Picosecond ground state recovery of the F-center in RbCl,KCl and KBr |
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| Authors: | Jan De Kinder Wim Joosen Dirk Schoemaker |
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| Institution: | 1. Physics Department , University of Antwerp (U.I.A.) Universiteitsplein 1 , B-2610 Antwerp (Wilrijk), Belgium;2. F.O.M. Institute for Atomic and Molecular Physics , Kruislaan 407, 1098 SJ, Amsterdam, The Netherlands |
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| Abstract: | Abstract Optical pump-probe measurements on the F-center in RbCl, KCl and KBr show a ps ground state recovery, when a substantial number of F-aggregates is present. The observed de-excitation process becomes faster for a larger concentration of aggregate centers and is related to energy transfer from the excited state of the F-center to aggregate centers. This energy transfer occurs towards F2- and N-centers in KCl. Our results are in accordance with measurements of the quantum efficiency of the F-center luminescence and with transient absorption measurements. |
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