X-ray filter assembly for fluorescence measurements of x-ray absorption fine structure

Edward A. Stern, Steve M. Heald

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284 Scopus citations


Fluorescence detection, in principle, permits the detection of the extended x-ray absorption fine structure (EXAFS) of more dilute atoms than can be obtained in absorption. To take advantage of this it is necessary, in practice, to eliminate the background that normally accompanies the fluorescence signal. We describe an x-ray filter assembly that accomplishes this purpose. The unique characteristic of the assembly is a slit system that minimizes the fluorescence background from the filter. The theory of the slit assembly is presented and is found to agree with measurements made on the Fe EXAFS of a dilute sample. The filter assembly has a better effective counting rate in this case than that of a crystal monochromator design.

Original languageEnglish
Pages (from-to)1579-1582
Number of pages4
JournalReview of Scientific Instruments
Issue number12
StatePublished - 1979
Externally publishedYes

Bibliographical note

Funding Information:
One of us (EAS) is indebted to a stimulating conversation with Dr. David F. Anderson which sparked the line of thought leading to the design presented here. Our thanks are also due to Dave Garcia and Don Russell for machining the slit assembly. SSRL is supported by the National Science Foundation in cooperation with the Department of Energy. This work was supported in part by a research grant from the National Science Foundation.


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