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We have developed a new method for determining surface exciton band energies in alkali halides based on velocity-resolved atomic desorption (VRAD). Using this new method, we predict the surface exciton energies for KI, KBr, KCl, and NaCl within +/-0.15 eV. Our data, the measured and calculated shifts of the surface exciton energies with respect to the bulk excitons, combined with the available EELS...
Irradiation of cleaved KI single crystals with photons near the bulk absorption threshold between 5.1 and 6.0 eV produces hyper-thermal I( 2 P 3/2 ) emission with a minor thermal component, and with little spin orbit excited I( 2 P 1/2 ) emission. The I-atom kinetic energy distribution may be tuned by choice of photon energy indicating that control...
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