Size effect of powdered sample on EXAFS amplitude

Kun quan Lu, E. A. Stern

Research output: Contribution to journalArticlepeer-review

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Powdered samples samples are commonly used to measure the extended X-ray absorption fine structure (EXAFS) and near-edge structure. It is shown that sizes of particles typically employed produce significant reduction in the EXAFS amplitude for concentrated samples. The distortion is calculated and found to be in good agreement with measurements on FeSi2 samples. To obtain accurate EXAFS amplitudes on powdered samples it is necessary to use particles significantly smaller than 400 mesh when the atom of interest is concentrated.

Original languageEnglish
Pages (from-to)475-478
Number of pages4
JournalNuclear Instruments and Methods In Physics Research
Issue number1-3
StatePublished - 1 Jul 1983
Externally publishedYes

Bibliographical note

Funding Information:
It is obvious that each particle in the sample exposes varying thickness to the beam, and even if the powder were completely composed of one size of particle, the beam would sense a spread in thickness. The transmittal intensity I through a spherical particle with diameter D * Research supported by NSF grants DMR 80-22221 and PCM 79-03674. ** Now at permanent address: Institute of Physics, Academica Sinica, Beijing, People's Republic of China.


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