Crystalline AIN film that was prepared by post-irradiation under specific c
onditions has been examined by reflection high-energy electron diffraction
(RHEED) and ion scattering spectroscopy (ISS). The RHEED pattern clearly in
dicated that an AlN crystalline structure is grown on an Al substrate under
irradiation of 12 keV N-2(+) ions impinged on the Al surface at normal inc
idence. However, ISS revealed that the topmost surface is not the stoichiom
etric composition corresponding to AlN, but is significantly Al-rich. Copyr
ight (C) 2001 John Wiley & Sons, Ltd.