S. Pulm et al., ELECTRON-EMISSION FROM THE INTERACTION OF HE PROJECTILES AND UV PHOTONS WITH LIF ON W(110), Radiation effects and defects in solids, 128(1-2), 1994, pp. 151-162
The electronic structure of thin LF adlayers deposited on W(110) at ro
om temperature is studied by ion impact electron spectroscopy (IIES) w
ith He+ ions, metastable impact electron spectroscopy (MIES) with Heatoms, ultraviolet photoelectron spectroscopy (UPS), and to some exten
t with electron energy loss spectroscopy (EELS). The transition from t
he electronic structure of single adsorbed molecules to the emergence
of the bulk structure could be studied by following the emergence of b
ulk properties, in particular the bandgap, as a function of the LiF ex
posure. The first step in the layer growth is molecular absorption of
LiF. The next step is the formation of islands formed by the LiF molec
ules. The production of vacancies in the 2p F orbital under the influe
nce of the ionizing radiation is studied as a function of the LiF expo
sure. Their relevance for the desorption processes induced by electron
ic transitions (DIET) is discussed.