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Generalized Ramsauer-Townsend effect in extended x-ray-absorption fine structure
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UNSPECIFIED (2001) Generalized Ramsauer-Townsend effect in extended x-ray-absorption fine structure. PHYSICAL REVIEW B, 6418 (18). -. ISSN 0163-1829.
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Abstract
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 | ||||
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Subjects: | Q Science > QC Physics | ||||
Journal or Publication Title: | PHYSICAL REVIEW B | ||||
Publisher: | AMERICAN PHYSICAL SOC | ||||
ISSN: | 0163-1829 | ||||
Official Date: | 1 November 2001 | ||||
Dates: |
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Volume: | 6418 | ||||
Number: | 18 | ||||
Number of Pages: | 4 | ||||
Page Range: | - | ||||
Publication Status: | Published |
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