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The velocity distribution of emission electrons in the transfer ionization process of 70keV He2+ colliding on He has been studied with a reaction microscope. These distributions show that the electrons lie mainly in the scattering plane which are observed to be emitted preferentially in the forward direction, lying between 0 and projectile velocity Vp. The distributions also display a typical two-fingered structure with a local minimum on internuclear axis. This characteristic can be qualitatively explained as being due to the interference between σ amplitude and π amplitude of electrons final wavefunction. It depends also on the impact parameters; the π amplitude contribution is dominant at small impact parameters, which leads to a symmetric velocity distribution around the internuclear axis. However, at large impact parameters the σ amplitude contribution increases relatively obviously, resulting in an asymmetric electrons velocity distribution around the internuclear axis.
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Keywords:
- reaction microscope /
- transfer ionization /
- velocity distributions of electrons /
- interference of σ amplitude and π amplitude
[1] Afaneh F, Dorner R, Schmidt L, Weber T, Stiebing K E, Jagutzki O, Schmidt-Bocking H 2002 J. Phys. B 35 L229
[2] Olson R E 1983 Phys. Rev. A 27 1871
[3] Olson R E, Gay T J, Berry H G, Hale E B, Irby V D 1987 Phys. Rev. Lett. 59 36
[4] Bernardi G C, Suez S, Fainstein P D, Garibotti C R, Meckbach W, Focke P 1989 Phys. Rev. A 40 6863
[5] Irby V D, Gay T J, Edwards J W, Hale E B, McKenzie M L, Olson R E 1988 Phys. Rev. A 37 3612
[6] Abdallah M, Kravis S, Cocke C L, Wang Y, Rodriguez V D, Stkli M 1997 Phys. Rev. A 56 2000
[7] Abdallah M A, Cocke C L, Wolff W, Wolf H E, Stkli M 2001 Phys. Rev. A 63 024702
[8] Abdallah M A, Wolff W, Wolf H E, Cocke C L, Stkli M 1998 Phys. Rev. A 58 R3379
[9] Ma X W, Zhu X L, Liu H P, Li B, Zhang S F, Cao S P, Feng W T, Xu S Y 2008 Sci. China G 38 1 (in Chinese) [马新文、朱小龙、刘惠萍、李 斌、张少锋、曹士娉、冯文天、许慎跃 2008 中国科学G 38 1] 〖10] Zhu X L, Ma X W, Li B, Liu H P, Chen L F, Zhang S F, Feng W T 2009 ActaPhys. Sin. 58 2077 (in Chinese) [朱小龙、马新文、李 斌、刘惠萍、陈兰芳、张少锋、冯文天 2009 58 2077]
[10] Cao S P, Ma X W, Drn A, Dürr M, Ullrich J 2007 Acta Phys. Sin. 56 6386 (in Chinese) [曹士娉、马新文、Drn A、Dürr M、Ullrich J 2007 56 6386]
[11] Feng W T, Ma X W, Liu H P, Chen L F, Li B, Cao S P 2007 Acta Phys. Sin. 56 3637 (in Chinese) [冯文天、马新文、刘惠萍、陈兰芳、李 斌、曹士娉 2007 56 3637]
[12] Wiley W C, McLaren I H 1955 Rev. Sci. Instrum. 26 1150
[13] Ullrich J, Moshammer R, Dorn A, Dorner R, Schmidt L P H, Schmidt-Bocking H 2003 Rep. Prog. Phys. 66 1463
[14] Drner R, Khemliche H, Prior M H, Cocke C L, Gary J A, Olson R E, Mergel V, Ullrich J, Schmidt-Bcking H 1996 Phys. Rev. Lett. 77 4520
[15] Pieksma M, Ovchinnikov S Y 1994 J. Phys. B 27 4573
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[1] Afaneh F, Dorner R, Schmidt L, Weber T, Stiebing K E, Jagutzki O, Schmidt-Bocking H 2002 J. Phys. B 35 L229
[2] Olson R E 1983 Phys. Rev. A 27 1871
[3] Olson R E, Gay T J, Berry H G, Hale E B, Irby V D 1987 Phys. Rev. Lett. 59 36
[4] Bernardi G C, Suez S, Fainstein P D, Garibotti C R, Meckbach W, Focke P 1989 Phys. Rev. A 40 6863
[5] Irby V D, Gay T J, Edwards J W, Hale E B, McKenzie M L, Olson R E 1988 Phys. Rev. A 37 3612
[6] Abdallah M, Kravis S, Cocke C L, Wang Y, Rodriguez V D, Stkli M 1997 Phys. Rev. A 56 2000
[7] Abdallah M A, Cocke C L, Wolff W, Wolf H E, Stkli M 2001 Phys. Rev. A 63 024702
[8] Abdallah M A, Wolff W, Wolf H E, Cocke C L, Stkli M 1998 Phys. Rev. A 58 R3379
[9] Ma X W, Zhu X L, Liu H P, Li B, Zhang S F, Cao S P, Feng W T, Xu S Y 2008 Sci. China G 38 1 (in Chinese) [马新文、朱小龙、刘惠萍、李 斌、张少锋、曹士娉、冯文天、许慎跃 2008 中国科学G 38 1] 〖10] Zhu X L, Ma X W, Li B, Liu H P, Chen L F, Zhang S F, Feng W T 2009 ActaPhys. Sin. 58 2077 (in Chinese) [朱小龙、马新文、李 斌、刘惠萍、陈兰芳、张少锋、冯文天 2009 58 2077]
[10] Cao S P, Ma X W, Drn A, Dürr M, Ullrich J 2007 Acta Phys. Sin. 56 6386 (in Chinese) [曹士娉、马新文、Drn A、Dürr M、Ullrich J 2007 56 6386]
[11] Feng W T, Ma X W, Liu H P, Chen L F, Li B, Cao S P 2007 Acta Phys. Sin. 56 3637 (in Chinese) [冯文天、马新文、刘惠萍、陈兰芳、李 斌、曹士娉 2007 56 3637]
[12] Wiley W C, McLaren I H 1955 Rev. Sci. Instrum. 26 1150
[13] Ullrich J, Moshammer R, Dorn A, Dorner R, Schmidt L P H, Schmidt-Bocking H 2003 Rep. Prog. Phys. 66 1463
[14] Drner R, Khemliche H, Prior M H, Cocke C L, Gary J A, Olson R E, Mergel V, Ullrich J, Schmidt-Bcking H 1996 Phys. Rev. Lett. 77 4520
[15] Pieksma M, Ovchinnikov S Y 1994 J. Phys. B 27 4573
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