Generalized Ramsauer-Townsend effect in extended x-ray-absorption fine structure
UNSPECIFIED. (2001) Generalized Ramsauer-Townsend effect in extended x-ray-absorption fine structure. PHYSICAL REVIEW B, 6418 (18). -. ISSN 0163-1829Full text not available from this repository.
Discontinuities in the phase of several double scattering path contributions to the calculated extended x-ray-absorption fine structure (EXAFS) at the zinc K edge in the zinc tetraimidazole cluster have been observed. The double scattering contribution has an amplitude which is close to zero and undergoes a jump discontinuity of pi in the phase. The position in k space of this feature is sensitive to the geometry of the path and the atoms involved. The origin of this discontinuity is traced to a generalized Ramsauer-Townsend resonance at a nitrogen atom. With a shift of geometry the energy of the discontinuity is found to move in a systematic manner. a consequence of the curvature of the photoelectron wave front, the typical EXAFS scattering being of Fresnel type. The results are discussed in the context of Nye-Berry phase dislocations and the implications for EXAFS analysis are examined.
|Item Type:||Journal Article|
|Subjects:||Q Science > QC Physics|
|Journal or Publication Title:||PHYSICAL REVIEW B|
|Publisher:||AMERICAN PHYSICAL SOC|
|Date:||1 November 2001|
|Number of Pages:||4|
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