BRILLOUIN-ZONE-SELECTION EFFECTS IN GRAPHITE PHOTOELECTRON ANGULAR-DISTRIBUTIONS

Experimental and theoretical graphite valence-band photoelectron angular distributions are presented and compared. We observe a zone-selection effect, wherein interference between photoelectron amplitudes from the two atoms in each graphene unit cell cause both and states to appear with different intensity in otherwise equivalent Brillouin zones. To simulate the experimental graphite valence-band photoelectron angular distributions, our simple model includes effects of (1) valence-band wave functions and (2) the relative emission path-length difference, from the atoms in each unit cell to ones detector (which is determined by the experimental geometry). © 1995 The American Physical Society.