Abstract
We measured scanned-angle x-ray photoelectron diffraction (XPED) patterns from both SrF2(111) and MgF2(001) surfaces, which exhibit complex element-specific characteristics: (1) A set of Kikuchi bands due to Bragg reflection of photoelectrons by {111} planes are detectable for Sr 3p3/2 emission, but not for F 1s emission from SrF2(111). (2) By contrast, {111} bands are observed for F 1s emission, but not for Mg 2s emission from MgF2(001). (3) {110} bands are weak for F emission and strong for Mg emission from MgF2(001). We have used the simple two-beam model of the Kikuchi-band formation to interpret the phenomena and found out that the two kinds of element-specific extinction of the Kikuchi bands occur in completely different ways; the extinction mechanisms have been confirmed by multiple-scattering cluster calculation, another more accurate approach to simulating XPED patterns.
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