Abstract
We investigated temporal evolutions of the luminescence spectra in KBr $F$ centers at $5\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ using the up-conversion spectroscopy method, and observed damped wave-packet oscillation on the adiabatic potential-energy surface in the excited state. The wave-packet behavior is quite different from that observed through previous pump-probe measurements. The result shows that in the excited state the vacancy trapped electron interacts predominantly with the bulk phonon modes, in contrast to the ground state where it couples mainly to the ${A}_{1g}$ local mode.
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