Darmstadt 2008 – scientific programme
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A: Fachverband Atomphysik
A 30: Precision spectroscopy III
A 30.4: Talk
Friday, March 14, 2008, 14:45–15:00, 3C
Chemical Shift of K transitions in Manganese — Detlev Gotta, Thomas Strauch, and •Christian Weidemann — IKP, FZ Jülich
Precision measurements of X-ray energies in the few keV range must take into account chemical shifts of the Kα fluorescence radiation. In a recent measurement MnO2 was used as calibration standard, which itself had to be calibrated against the precisely measured values of metallic Mn. For that, a systematic study of the shift in manganese compounds was performed by using a high precision Bragg-spectrometer. The energies of the Kα1,2 transitions from Mn metal and Mn compounds were measured with a relative accuracy of 10 - 20 meV. According to the line shape model of [1] the Mn metal spectrum was fitted and the tabulated peak energy has been used for absolute calibration for the Kα1 lines. The transition energies of the various Mn compounds, representing different valences of manganese, show significant chemical effects. Compared to previous measurements [2] the accuracy could be improved by factors 6 to 10. To check the spectrometer system for consistency the Kβ-spectra were measured for the same compounds. In agreement with previously obtained data, chemical shifts up to 1.6 eV were found for the Kβ1,3 transition.
[1] Förster, E. et al., Phys. Rev. A 56 No. 6 (1997).
[2] Meisel, A.; Döring, E., Über den Einfluss chemischer Bindung
auf das Kα-Dublett von Mangan, Leipzig (1962).