EGAS41 - Swansea University

41 st EGAS CP 24 Gdańsk 2009
Interference spectra involving doubly excited states
[1s2p]( 3 P)3p 2 (J=1) in 1s photoionization of Ne
J.J. Wan 1 , C.Z. Dong 1,2,∗
1 College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou
730070, Gansu, China
2 Joint Laboratory of Atomic and Molecular Physics, NWNU & IMP CAS, Lanzhou 730070,
Gansu, China
∗ Corresponding author: dongcz@nwnu.edu.cn
Combining the multiconfiguration Dirac-Fock (MCDF) method and the Fano technique
[1], the interference effects between photoionization and photoexcitation autoionization
involving doubly excited [1s2p]( 3 P)3p 2 (J=1) states of neon have been studied theoretically.
The resonant excitation energies from the ground state 1s 2 2s 2 2p 6 1 S 0 to the doubly
excited states [1s2p]( 3 P)3p 2 (J=1) and the relevant bound/continuum-bound transition
matrix elements have been calculated by using RATIP package [2-4] and RERR06 code
[5-6] and then the Fano parameters q and ρ 2 can be obtained. In Fig. 1, the fine structure
of the calculated interference spectra is compared with the available experiment [7],
and the dominant contribution to the strength and profile resulting from some individual
resonances are shown.
Relative strength
Photoabsorption cross section (10 -19 cm 2 )
1.0
0.9
0.8
2.14
2.12
2.10
2.08
2.06
3.5
3.0
2.5
2.0
3.5
3.0
2.5
2.0
15
10
15 05
10
30 05
10
20
6
2.75 0
2.50
7
2.25
2.00
2.13
2.12
8
2.11
2.10
2.15
2.14
9
2.13
2.12
2.11
897 898 899 900 901 902 903 904 905
Photon energy (eV)
Figure 1: Comparison between the experimental spectra [7] and the calculated individual interference
profile in Babushkin gauge. The theoretical energies are shifted by +2 eV for comparison.
EXP
1
2
3
4
5
References
[1] U. Fano, Phys. Rev. 124, 1866 (1961)
[2] S. Fritzsche, et al., Comput. Phys. Commun. 124, 340 (2000)
[3] S. Fritzsche, et al., Nucl. Instr. Meth. Phys. Res. B 205, 93 (2003)
[4] S. Fritzsche, J. Electron Spectrosc. Relat. Phenom. 114-116, 1155 (2001)
[5] J.J. Wan, et al., J. Phys.: Conf. Ser. 58, 367 (2007)
[6] C.C. Sang, et al., Acta Phys. Sin. 57, 2152 (2008) (in Chinese)
[7] M. Oura, et al., Phys. Rev. A 70, 022710 (2004)
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