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  • Articles: DFG German National Licenses  (4)
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  • Articles: DFG German National Licenses  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 966-974 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: It has been observed that the reflectivity of the (110) planes of a quartz lamina can be increased by submitting it to a static or alternating electric field. Measurements have been performed on 2.5 and 6 mm thick plates using a curved-crystal spectrometer with DuMond geometry. Photon energies were in the range 50 to 300 keV. Under the proper conditions, the increase in reflectivity is accompanied by negligible loss in resolution. The effects are explained by the occurrence of a quasi-mosaicity.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-6079
    Keywords: 34.50 ; 34.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract K α X-ray spectra were measured with a Du Mond type curves crystal spectrometer for42Mo and46Pd targets bombarded with oxygen ions at 5.5 MeV/u energy (i.e. at velocity closely matching those of the targetL-shell electrons). The distribution ofL-shell vacancies produced in collisions with simultaneousK-shell ionization is deduced from the measured yield distribution of theK α X-ray satellites. The distribution shows deviations from the binomial ones. The deviations can be accounted for by assuming that theL-shell vacancy production is due to two uncorrelated processes: the direct ionization by impact and the electron capture from theL-shell of the target atom into theK-shell of the projectile, both occurring at nearly central collisions. The corresponding probability values are deduced using simple statistical considerations.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1434-6079
    Keywords: 34.50.H ; 32.20.R ; 32.70.J
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract TheKβ spectra of molybdenum, palladium and lanthanum bombarded by 6.7 MeV/amu4He ions were measured with a transmission curved crystal spectrometer.L andM satellite lines were observed and resolved. Experimental energies are compared with those calculated with a MCDF program.M -shell ionization probabilities are deduced from the measured satellite intensity ratios and compared with theoretical (SCA) predictions. The experimental values are found to be higher than the calculated ones (by a factor of 2 for La and a factor of about 4 for Mo and Pd). The influence of coupling effects, electron wave functions, electron capture, electron correlation and target activation is discussed.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1434-6079
    Keywords: 32.20.R ; 34.50.H
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract TheK β X-ray spectra of42Mo,46Pd and57La bombarded with4He ions at energy 6.7 MeV/amu (i.e. at velocity closely matching those of the targetL-shell electrons) have been measured with a transmission curved crystal spectrometer.L-shell ionization probabilities in near central collisions (i.e. in those leading to the removal of aK-shell electron) were deduced from the yields ofL-satellite lines ofK β1,3 transitions. The values obtained are compared with theoretical (RSCA) predictions and found to deviate increasingly with the reduced velocity of the projectile.
    Type of Medium: Electronic Resource
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