Low-Energy Rate Enhancement in Recombination Processes of Electrons into Bare Uranium Ions
WU Yong1, ZENG Si-Liang1, DUAN Bin1, YAN Jun1, WANG Jian-Guo 1,2, DONG Chen-Zhong 3, MA Xin-Wen2
Key Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, PO Box 8009-57, Beijing 100088
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000
Department of Physics, Northwest Normal University, Lanzhou 730000
Low-Energy Rate Enhancement in Recombination Processes of Electrons into Bare Uranium Ions
Key Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, PO Box 8009-57, Beijing 100088
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000
Department of Physics, Northwest Normal University, Lanzhou 730000
摘要Based on the Dirac--Fork--Slater method combined with the multichannel quantum defect theory, the recombination processes of electrons into bare uranium ions (U 92+ ) are investigated in the relative energy range close to zero, and the x-ray spectrum emitted in the direct radiative recombination and cascades processes are simulated. Compared with the recent measurement, it is found that the rate enhancement comes from the additional populations on high Rydberg states. These additional populations may be produced by other recombination mechanisms, such as the external electric-magnetic effects and the many-body correlation effects, which still remains an open problem.
Based on the Dirac--Fork--Slater method combined with the multichannel quantum defect theory, the recombination processes of electrons into bare uranium ions (U 92+ ) are investigated in the relative energy range close to zero, and the x-ray spectrum emitted in the direct radiative recombination and cascades processes are simulated. Compared with the recent measurement, it is found that the rate enhancement comes from the additional populations on high Rydberg states. These additional populations may be produced by other recombination mechanisms, such as the external electric-magnetic effects and the many-body correlation effects, which still remains an open problem.
[1] Shi W, Bohm S, Bohme C, Brandau C, Hoffknecht A, Kieslich S,Schippers S, Muller A, Kozhuharov C, Bosch F, Franzke B, Mokler P H,Steck M, Stohlker Th and Stachura Z 2001 Eur. Phys. J. D 15 145 and references therein [2] Reuschl R, Gumberidze A, Fritzsche S, Kozhuharov C, Spillmann U,Stohlker Th, Surzhykov A and Tashenov S 2005 GSI Scientific Report2004 GSI 2005-1 p 202 [3] Gumberidze A, Stohlker Th, Banas D, Beckert K, Beller P,Beyer H F, Bosch F, Hagmann S, Kozhuharov C, Liesen D, Nolden F, Ma X,Mokler P H, Steck M, Sierpowski D and Tashenov S 2005 Phys. Rev. Lett. 94 23001 [4] Heerlein C, Zwicknagel G and Toepffer C 2002 Phys. Rev.Lett. 89 083202-1 [5] Tong X M, Liu L and Li J M 1994 Phys. Rev. A 494641 [6] Lee C M 1978 Phys. Rev. A 17 566 [7] Lee C M and Pratt R H 1975 Phys. Rev. A 12 1825 [8] Li J M and Zhao Z X 1982 Acta Phys. Sin. 31 97(in Chinese) [9] Wang J G, Tong X M and Li J M 1996 Acta Phys. Sin. 45 13 and references therein (in Chinese) [10] Schippers S, Muller A, Gwinner G, Linkemann J,Saghiri A A and Wolf A 2001 Astrophys. J. 555 1027 [11] Andersen L H, Pan G Y and Schmidt H T 1992 Phys. Rev. A 45 7868 [12] Parpia F A, Fischer C F and Grant I P 1996 Comput. Phys.Commun. 94 249 [13] Bethe H A and Salpeter E E 1957 Quantum Mechanics of One andTwo-Electron Systems (Berlin: Springer) [14] Zeng S L, Pang J Q, Li P, Li Y M, Yan J and Wang J G 2004 Acta Phys. Sin. 54 6 (in Chinese)
2007, Vol. 24 
