Abstract
Low-energy (10 eV–500 eV) He + ions are scattered from the LaB 6(001) surface and the ejected electrons are detected. Two characteristic peaks are discernible in the electron energy spectra; one is assignable to the surface state of the LaB 6(001) surface resulting from Auger deexcitation of He∗( 3S) descended from He +, and the other is due to autodetachment of temporary He − ions. These two peaks are very little broadened with increase of the velocity perpendicular to the surface, indicating that the electron emission occurs rather distant from the surface. On the other hand, marked energy broadening depending on the target species has been reported to occur if the electron is ejected via the Auger neutralization process. This is because Auger neutralization takes place even in a closer encounter with the individual surface atoms.
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