X-ray absorption and emission

Ls, Birks

doi:10.1021/ac60313a006

Cited by 17 publications

(4 citation statements)

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“…An entire paragraph is dedicated to ultra‐soft X‐rays, discussing three major additional problems: penetration depth, instrumentation and the change from line spectra to band spectra . One year later, Birks saw little progress in the measurement of atomic numbers below Na . Jecht described the general advances of XRF and the specific problems of fluorine analysis .…”

Section: Introductionmentioning

confidence: 99%

X‐ray‐induced alteration of specimens as crucial obstacle in XRF spectrometry of fluorine in rocks and soils

Pleßow

2012

X-Ray Spectrometry

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Occasionally suggested yet rarely performed X-ray fluorescence (XRF) spectrometry of fluorine seems to fail systematically in yielding reliable quantitative results for rocks and soils. Repeated analyses reveal continuously drifting fluorescence intensities for fluorine, boron and chlorine. Typically, an increase, but in few cases also a decrease, over X-ray exposure time is observed. For instance, fluorine concentrations in a soil standard appear to increase steadily from below the detection limit in the first run to nearly 850 mg/kg F more than 10 h later in the last. In contrast, cryolite is characterised by drastically decreasing intensities for fluorine. Although fluorescence intensities may be affected by preparation methods, specimen surface conditions and dynamic contamination, it is shown that none of these influencing factors is responsible for the observed trends. In fact, there is evidence that X-radiation impact mobilises fluorine, boron and chlorine. Diffusion of radiolysis products towards the specimen's surface as well as the kinetics of adsorption and desorption or chemical reactions are believed to control the analyte concentration in the analysed layer decisively. Furthermore, during analysis, the latter is altered by considerable losses of binder or fluxif applicable thus enhancing XRF intensities of boron and fluorine because of reduced absorption. In any case, signal stability appears to be limited by insufficient sample and specimen stability. It is concluded that for many soil and rock samples, XRF spectrometry is inappropriate to quantify fluorine, although the crucial obstacle is neither the analytical method nor the spectrometer sensu strictu.

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Section: Introductionmentioning

confidence: 99%

X‐ray‐induced alteration of specimens as crucial obstacle in XRF spectrometry of fluorine in rocks and soils

Pleßow

2012

X-Ray Spectrometry

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“…The names of these reviews are X‐Ray Absorption and Emission and, since 1976, X‐Ray Spectrometry . The authors of these review papers are the known American specialists H. A. Liebhafsky, E. H. Winslow, and H. Pfeiffer (1960 and 1962), W. J. Campbell and J. D. Brown (1964), W. J. Campbell, J. D. Brown, and J. W. Thatcher (1966 and 1968), W. J. Campbell and J. V. Gilfrich (1970), L. S. Birks (1972), and L. S. Birks and J. V. Gilfrich (1974 and 1976) . Figure presents data of the annual number of publications on X‐ray spectral analysis .…”

Section: Brief Characteristics Of the Journalmentioning

confidence: 99%

“…The names of these reviews are X-Ray Absorption and Emission and, since 1976, X-Ray Spectrometry. Birks (1972), and L. S. Birks and J. V. Gilfrich (1974 and. [1][2][3][4][5][6][7][8][9] Figure 1 presents data of the annual number of publications on X-ray spectral analysis.…”

Section: Brief Characteristics Of the Journalmentioning

confidence: 99%

“…Birks (1972), and L. S. Birks and J. V. Gilfrich (1974 and. [1][2][3][4][5][6][7][8][9] Figure 1 presents data of the annual number of publications on X-ray spectral analysis. [10] The total number of papers on X-ray spectral analysis in 1971 (before the publication of the first issue of X-Ray Spectrometry) was about 200.…”

Section: Brief Characteristics Of the Journalmentioning

confidence: 99%

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On the 40th anniversary of the journal X‐Ray Spectrometry

Ревенко

2012

X-Ray Spectrometry

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This journal, X‐Ray Spectrometry, celebrates its 40th anniversary this year. The state of the publications on X‐ray spectral analysis from 1972 onward is considered. The distribution of materials over countries is presented, as published in X‐Ray Spectrometry for 40 years, in 5‐year time intervals: 1972–1976, 1977–1981, and so on. The participation of Russian scientists contributing to the publications in this journal is discussed. Copyright © 2012 John Wiley & Sons, Ltd.

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Absorption Techniques inX‐Ray Spectrometry

Kawai

2000

Encyclopedia of Analytical Chemistry

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X‐ray absorbance depends on the wavelength of the X‐rays, atomic number, chemical environment, and concentration of analyte. X‐ray absorption spectrometry is a technique for analyzing the chemical environment of an element in an unknown material. This method is closely related to photoelectron spectroscopy, Auger electron spectroscopy, and X‐ray fluorescence spectroscopy. Chemical information in the chemical shift and line shape of XANES (X‐ray absorption near‐edge structure) spectra is described. The history and theory of EXAFS (extended X‐ray absorption fine structure) are discussed in relation to other experimental techniques. Data analysis methods, databases, software packages, instrumentation, and synchrotron radiation facilities for X‐ray absorption analysis are overviewed. Alternative methods such as electron energy loss spectroscopy (EELS), self‐absorption effect, extended X‐ray emission fine structure (EXEFS), X‐ray Raman scattering, diffraction anomalous fine structure (DAFS), β‐environment fine structure (BEFS), and inverse photoemission spectroscopy (IPES) are also described.

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X-ray absorption and emission

Cited by 17 publications

References 482 publications

X‐ray‐induced alteration of specimens as crucial obstacle in XRF spectrometry of fluorine in rocks and soils

X‐ray‐induced alteration of specimens as crucial obstacle in XRF spectrometry of fluorine in rocks and soils

On the 40th anniversary of the journal X‐Ray Spectrometry

Absorption Techniques inX‐Ray Spectrometry

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