Abstract
We present the results of a study of the azimuthal-angle dependence of ${\mathrm{Ne}}^{**}$ excited-state production in ${\mathrm{Ne}}^{+}$ ion scattering on an Al(111) surface. A strong variation in the intensity of ${\mathrm{Ne}}^{**}[2{p}^{4}(^{3}P)3{s}^{2}]$ and ${\mathrm{Ne}}^{**}[2{p}^{4}(^{1}D)3{s}^{2}]$, and most importantly in their relative intensity, is observed as a function of crystal azimuth. This is interpreted as being due to a change in singlet-to-triplet atomic-core rearrangement of excited scattered Ne projectiles as they move away from the surface. Numerical simulations were performed and these variations in rearrangement rates were assigned to a rapid change in the perpendicular velocity distributions of scattered particles as a function of incidence azimuth. We conclude that nonlocalized atomic rearrangement processes play an important role in the singlet-to-triplet core rearrangement.
Published Version
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