J. Kolodziej et al., A COMPARISON OF ELECTRON-STIMULATED DESORPTION OF HALOGEN ATOMS FROM DIFFERENT ALKALI-HALIDE SINGLE-CRYSTALS, Radiation effects and defects in solids, 128(1-2), 1994, pp. 47-54
Kinetic energy distributions of halogen atoms emitted due to electron-
stimulated desorption (ESD) were measured for a (100) surface of NaCl-
type alkali-halide crystals (NaCl, NaI, NaF, KCl, KBr, KI, RbCl, RbBr,
RbI) under the same experimental conditions. It was found that energy
spectra of halogen atoms emitted from potassium and rubidium chloride
s, bromides, and iodides, kept at temperatures below 250 degrees C, co
nsist of two components: the thermal (Maxwellian) peak and the higher
energy peak (at about 0.25 eV) whose energy is temperature-independent
. From the energy spectra and complementary total yield measurements r
elative desorption rates for both thermal and nonthermal components we
re determined for air investigated samples. The results are compared w
ith predictions of the Rabin-Klick criterion and the self-trapped exci
ton relaxation energy calculations by Song et al.. Finally, it is show
n that the hyperthermal halogen emission could be well correlated with
a measure of the excess space between the neighboring halogen ions in
the lattice. This correlation is consistent with the recently propose
d concepts of ESD from alkali halide surfaces.