Observation of Excitonic Effects in Excited Neutral Alkali Desorption from Alkali Halides
We report simultaneous measurements of excited state alkali desorption and photoelectron emission from NaCl irradiated by ultraviolet light from a synchrotron source. The excitation function shows structure near known exciton energies. Incident photons of energy sufficient for core-exciton production are seen to channel energy away from broad-band bulk luminescence and toward electron and excited alkali atom emission. This suggests that excitons can play a direct role in excited-atom, neutral desorption.
KeywordsExcitation Function Excited Atom Electron Yield Exciton Energy Total Electron Yield
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