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  • 1
    Electronic Resource
    Electronic Resource
    Measurement of K X-ray fluorescence cross-sections (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 10 (1981), S. 128-130 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Absolute values of K X-ray fluorescence (XRF) cross-sections have been calculated for elements 11 ≤ Z ≤ 69 at three excitation energies corresponding to Mn, Ag and Te K X-rays from 55Fe, 109Cd and 125I radioisotopes respectively and the fourth energy corresponding to the 59.60 keV γ-ray from 241Am. Measurements were also made for these cross-sections for ten elements with 18 ≤ Z ≤ 48 at two excitation energies from 109Cd and 125I radioisotopes. The measured values are compared with those obtained from theoretical considerations and a good agreement is found.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300100309
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Photon-excited K X-ray fluorescence cross-section measurements for some low-Z-elements (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 17 (1988), S. 53-54 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: X-ray fluorescence cross-section for Kα x-ray lines were measured for the light elements Na, Mg, Al, Si, S, Cl and K relative to Ca at a photon excitation energy of 5.97 keV (Mn K x-ray). A windowless retractable Kevex Si(Li) detector system having an energy resolution of 146 eV at 6.4 keV was used for the detection of the characteristic K x-rays. The measurements were performed in a vacuum chamber maintained at a pressure of ca 10-7 Torr using a 55Fe radioactive excitation source and targets of ultra-pure elements/compounds of the above-mentioned elements. Cross-sections were also calculated using photoelectric cross-sections, fluorescence yields and the fractional x-ray emission rates. Measured and calculated x-ray fluorescence cross-sections agreed within reasonable limits.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300170205
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Fluorescence cross-sections for L shell x-ray lines (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 15 (1986), S. 217-219 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Absolute values of x-ray fluorescence (XRF) cross-sections for Lα lines have been calculated for all the elements with 47 ≤ Z ≤ 92 at two exciting energies corresponding to Ag and Te K x-rays from 10Cd and 125I radioisotopes, respectively. The effect of hole transfer within L subshells is also included when calculating the cross-sections. Experimental measurements were carried out for Lα, L1 and LTotal x-ray fluorescence cross-sections for some of the elements ranging from Ho to U using exciter sources of 109Cd and 125I. Average L shell fluorescence yields were also obtained using the measured values of total L shell x-ray fluorescence cross-sections and the theoretical values of photoelectric cross-sections.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300150312
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of coster-kronig transitions on L3 sub-shell x-ray fluorescence cross-sections (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 18 (1989), S. 77-80 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Coster-Kronig processes are radiationless transitions in which an inner-shell vacancy is transferred from one subshell of an atom to another that is less tightly bound, both belonging to the same principal shell. Experimental measurements were carried out on a few elemental samples to examine the effect of Coster-Kronig transitions on fluorescence cross-sections for the Lα x-ray line using 22.6 keV Ag K x-rays for excitation. Absolute values of Lα cross-sections were also calculated with incorporation of the enhancement due to the Coster-Kronig effect for the elements in the range 41 ≤ Z ≤ 92 at the same excitation energy. A windowless Si(Li) detector system with an energy resolution of 145 eV at 6.4 keV x-ray energy was used. Thin-film samples were employed to minimize the self-absorption effect. Reasonably good agreement was observed between the expected and measured values.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300180209
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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