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Based on the excitation cross-sections in collisions of H(1s) atoms with He2+ obtained by using the classical trajectory Monte Carlo method, the state-selective cross-sections of excitation processes for different n and m, where n and m are the principal and magnetic quantum numbers respectively, are studied with the application of strong longitudinal and transverse magnetic fields. Meanwhile, the precise energy levels for atom H in strong magnetic fields are obtained by non-perturbative quantum method. It is found that there is some strong separation of the state-selective cross-sections among different magnetic quantum states. Such behaviors are related to the variation of the energy levels and the diamagnetic terms induced by the applied magnetic fields. The diamagnetic terms in transverse magnetic fields result in the rapid increase of the cross-sections for the state of negative m at 25keV/u, which is further indicated by the trajectory in this case. In some cases the decrease of the total excitation cross-sections is found to be due to the rise of the energy levels caused by the magnetic fields. The orbital angular momentum along the direction of the magnetic field is not conserved absolutely; this phenomenon is found also in the trajectories and agrees with our analysis.
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Keywords:
- impact excitation in heavy-particle collisions /
- classical trajectory Monte Carlo method /
- strong magnetic field /
- state-selective cross-section
[1] Drake Gordon W F (Ed.) 2006Handbook of atom, molecular, and optical physics (Heidelberg: Springer-Verlag Press)
[2] Haberli R M, Gombosi T I, De Zeeuw D L 1997 Science 276939
[3] Grosdanov T P, McDowell M R C 1985 J. Phys. B 18 921
[4] Bradenbrink S, Sidky E Y, Roller-Lutz Z, Lutz H O 1997 J. Phys. B 30 L161
[5] Bradenbrink S, Sidky E Y, Roller-Lutz Z, Reihl H, Lutz H O 1997 Phys. Rev. A 55 4290
[6] Bradenbrink S, Reihl H, Roller-Lutz Z, Lutz H O 1997 J. Phys. B 30 5819
[7] Bivona S, McDowell M R C 1987 J. Phys. B 20 1541
[8] Suzuki S, Shimakura N, Kimura M 1996 J. Phys. B 29 1063
[9] He B, Wang J G, Janev R K 2009 Phys. Rev. A 79 012706
[10] Zhang H, Wang J G, He B, Qiu Y B, Janev R K 2007 Phys. Plasmas 14 053505
[11] Pandey M K, Lin Y C, Ho Y K 2012 Phys. Plasmas 19 062104
[12] Liu L, Wang J G, Janev R K 2008 Phys. Rev. A 77 042712
[13] Ding D, He B, Liu L, Zhang C H, Wang J G 2009 Acta Phys. Sin. 58 8419 (in Chinese) [丁丁, 何斌, 刘玲, 张程华, 王建国 2009 58 8419]
[14] Luka S, Fabio S 1997 J. Phys. B 29 751
[15] Lu Z Z, Chen D Y, Fan R W, Xia Y Q 2012 Appl. Phys. Lett. 100 014105
[16] Tom Kirchner 2004 Phys. Rev. A 69 063412
[17] Ning L N, Qi Y Y 2012 Chin. Phys. B 21 123201
[18] Xie L Y, Wang J G, Janev R K, Qu Y Z, Dong C Z 2012 Eur J. Phys. D 66 125
[19] Pinzola M S, Lee T G, Colgan J 2011 J. Phys. B 44 205204
[20] Abrines R, Percival I C 1966 Proc. Phys. Soc. London 88 861
[21] Ding D, He B, Qu S X, Wang J G 2013 Acta Phys. Sin. 62 033401 (in Chinese) [丁丁, 何斌, 屈世显, 王建国 2013 62 033401]
[22] Friedrich H 1998 Theoretical atomic physics (Heidelberg: Springer-Verlag Press)
[23] Ning F F, He J F, Zeng S L, Zou S Y, Yan J 2011 Acta Phys. Sin. 60 043201 (in Chinese) [倪飞飞, 何建锋, 曾思良, 邹士阳, 颜君 2011 60 043201]
[24] Reinhold C O, Olson R E, Fritsch W 1990 Phys. Rev. A 41 4837
[25] Winter T G 2007 Phys. Rev. A 76 026702
[26] Becker R L, MacKellar A D 1984 J. Phys. B 17 3923
-
[1] Drake Gordon W F (Ed.) 2006Handbook of atom, molecular, and optical physics (Heidelberg: Springer-Verlag Press)
[2] Haberli R M, Gombosi T I, De Zeeuw D L 1997 Science 276939
[3] Grosdanov T P, McDowell M R C 1985 J. Phys. B 18 921
[4] Bradenbrink S, Sidky E Y, Roller-Lutz Z, Lutz H O 1997 J. Phys. B 30 L161
[5] Bradenbrink S, Sidky E Y, Roller-Lutz Z, Reihl H, Lutz H O 1997 Phys. Rev. A 55 4290
[6] Bradenbrink S, Reihl H, Roller-Lutz Z, Lutz H O 1997 J. Phys. B 30 5819
[7] Bivona S, McDowell M R C 1987 J. Phys. B 20 1541
[8] Suzuki S, Shimakura N, Kimura M 1996 J. Phys. B 29 1063
[9] He B, Wang J G, Janev R K 2009 Phys. Rev. A 79 012706
[10] Zhang H, Wang J G, He B, Qiu Y B, Janev R K 2007 Phys. Plasmas 14 053505
[11] Pandey M K, Lin Y C, Ho Y K 2012 Phys. Plasmas 19 062104
[12] Liu L, Wang J G, Janev R K 2008 Phys. Rev. A 77 042712
[13] Ding D, He B, Liu L, Zhang C H, Wang J G 2009 Acta Phys. Sin. 58 8419 (in Chinese) [丁丁, 何斌, 刘玲, 张程华, 王建国 2009 58 8419]
[14] Luka S, Fabio S 1997 J. Phys. B 29 751
[15] Lu Z Z, Chen D Y, Fan R W, Xia Y Q 2012 Appl. Phys. Lett. 100 014105
[16] Tom Kirchner 2004 Phys. Rev. A 69 063412
[17] Ning L N, Qi Y Y 2012 Chin. Phys. B 21 123201
[18] Xie L Y, Wang J G, Janev R K, Qu Y Z, Dong C Z 2012 Eur J. Phys. D 66 125
[19] Pinzola M S, Lee T G, Colgan J 2011 J. Phys. B 44 205204
[20] Abrines R, Percival I C 1966 Proc. Phys. Soc. London 88 861
[21] Ding D, He B, Qu S X, Wang J G 2013 Acta Phys. Sin. 62 033401 (in Chinese) [丁丁, 何斌, 屈世显, 王建国 2013 62 033401]
[22] Friedrich H 1998 Theoretical atomic physics (Heidelberg: Springer-Verlag Press)
[23] Ning F F, He J F, Zeng S L, Zou S Y, Yan J 2011 Acta Phys. Sin. 60 043201 (in Chinese) [倪飞飞, 何建锋, 曾思良, 邹士阳, 颜君 2011 60 043201]
[24] Reinhold C O, Olson R E, Fritsch W 1990 Phys. Rev. A 41 4837
[25] Winter T G 2007 Phys. Rev. A 76 026702
[26] Becker R L, MacKellar A D 1984 J. Phys. B 17 3923
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