EGAS41 - Swansea University

41 st EGAS CP 105 Gdańsk 2009
Relativistic R-matrix calculation for photoionizations of atomic
magnesium
G.L. Wang 1 , X.X. Zhou 1,2 ,
1 College of Physics and Electronic Engineering, Northwest Normal University,
Lanzhou,730070, China
2 Joint Laboratory of Atomic and Molecular Physics, NWNU & IMP CAS,
Lanzhou, 730070, China
The photoionization cross sections of the ground level (3s 2 1 S 0 ) of magnesium, in the
energy region between the Mg + (3s) and Mg + (3p) threshold, has been calculated theoretically
using the fully relativistic R-matrix method [1]. The resonance positions and widths
have also been obtained and compared with a recent experiment [2]. Five Rydberg series
of doubly excited states have been exhibited in Fig. 1, i.e., 3pns 1 P, 3pnd 1 P, 3pns 3 P,
3pnd 3 D and 3pnd 3 P, which are in excellent agreement with experimental measurements.
As we know, it is the first time that the 3pnd 3 P were identified as the new fifth series.
Photoionization Cross Section (Mb)
4
2
04
2
40
2
0
Experiment
Present
Opacity Project
8 9 10 11 12
Photon energy (eV)
Cross section (Mb)
4
3
2
1
0.2
0.1
Present
Experiment
9.5 9.6
4 5 6 7 8 3pns 1 P 1
4 5 6 7 8 3pns 3 P 1
0.06
0.05
10.3416 10.3420
0.000
11.6688
0
3 4 5 6 3pnd 1 P
3 4 5 6 3pnd 3 1
D 6 3pnd 3 1
P 1
9.0 9.5 10.0 10.5 11.0 11.5 12.0
Photon energy (eV)
0.005
Figure 1: Comparison of present calculated cross sections with experimental results by Wehlitz
et al. [2] and OP results by Butler et al. [3].
References
[1] S. Ait-Tahar, I.P. Grant, P.H. Norrington, Phys. Rev. A 54, 3984 (1996)
[2] R. Wehlitz, D. Lukić, P.N. Juranić, J. Phys. B 40, 2385 (2007)
[3] K. Butler, C. Mendoza, C.J. Zeippen, J. Phys. B 26 4409 (1993)
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