EGAS41 - Swansea University

41 st EGAS CP 183 Gdańsk 2009
Study of the satellite and hypersatellite
M-X-ray line structures for uranium
J. Starosta ∗ , M. Polasik, K. S̷labkowska, K. Kozio̷l, P. Matuszak
Faculty of Chemistry, Nicolaus Copernicus University, 87-100 Toruń, Poland
∗ Corresponding author: joannast@doktorant.umk.pl
In order to explain the structure of various satellite (additional vacancies in N and/or O
shells) and hypersatellite (additional vacancies in M or M and N shells) Mα 1,2 and Mβ 1
lines in the X-ray spectra of heavy atoms the extensive multiconfiguration Dirac-Fock
calculations [1] have been carried out on uranium. For every calculated type of Mα 1,2
and Mβ 1 lines the theoretical stick spectra (line positions with their relative intensities)
have been presented. Moreover, for each type of lines two theoretical spectra have been
predicted: one being a sum of the Lorentzian natural line shapes and the other one being
a convolution of the Lorentzian natural line shapes sum with the Gaussian instrumental
response (see Fig. 1).
Figure 1: Calculated stick and predicted spectra for the Mα 1,2 and Mβ 1 diagram and M-shell
hypersatellite transitions [(b)-(e)] for uranium. Spectrum (e) is the summary spectrum [(b)+
(c)+(d)].
The obtained results will be helpful in reliable quantitative interpretation of a very
complex origin structure of Mα 1,2 and Mβ 1 lines in various high-resolution X-ray spectra
of heavy atoms induced by different light and heavy projectiles. Moreover, the absolute
intensities of the U M-X-ray lines can be helpful in application of X-ray measurements
from UO 2 as a reference material (virtual standard) for wavelength-dispersive electron
probe microanalysis (WDS-EPMA) [2]. This technique provides non-destructive method
of probe surface analysis and can be contribution to further research.
Acknowledgment
This work was supported by the Polish State Committee for Scientific Research under Grant
No. N N202 1465 33.
References
[1] M. Polasik, Phys. Rev. A 52 227 (1995)
[2] C. Merlet, X. Llovet et al., Microchim Acta 161 427 (2008)
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