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在共面双对称几何条件下,利用一阶扭曲波Born近似计算了中低能电子碰撞Ar原子(3p壳层电子)单电离的三重微分截面,并与最近的实验数据做了比较. 结果表明,对于Ar原子,当入射电子能量比电离阈高40 eV以上,随着入射能量的增加,binary和recoil碰撞机理逐渐占据支配地位;在近阈能量范围,上述碰撞机理不再处于支配地位,扭曲效应明显. 要完备地描述中低能入射条件下Ar原子的电子碰撞电离过程,理论模型必须同时考虑多种散射机理.
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关键词:
- 电子碰撞电离 /
- 共面双对称 /
- 一阶扭曲波Born近似 /
- Ar原子
The first-order distorted wave Born approximation (DWBA) has been performed for single ionization of Ar(3p) by electron impact in coplanar doubly symmetric geometry from near threshold to intermediate energies. Theoretical triple differential cross sections (TDCS) are compared with the latest experimental data. It is found that when the incident electron energies are 40 eV higher than the ionization threshold, for argon, the binary and recoil collision mechanism will dominat as the energies increase, but not in the near threshold energy regime, where the distortion effects are of great significance. In order to completely describe the electron impact ionization of argon, it is imperative that more scattering mechanisms should be considered in the theoretical models.-
Keywords:
- electron impact ionization /
- coplanar doubly symmetric /
- first-order distorted wave Born approximation /
- argon
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[1] Lahmam-Bennani A 1991 J. Phys. B: At. Mol. Opt. Phys. 24 2401
[2] [3] Weigold E, McCarthy I E 1999 Electron Momentum Spectroscopy (New York: Kluwer Academic/Plenum Publishers)
[4] [5] Brauner M, Briggs J S, Klar H 1989 J Phys B: At Mol Opt Phys 22 2265
[6] [7] Madison D H, Calhoun R V, Shelton W N 1977 Phys. Rev. A 16 552
[8] [9] [10] Chen Z J, Madison D H, Whelan C T, Walters H R J 2004 J. Phys. B: At Mol Opt Phys 37 981
[11] Chen Z J, Madison D H 2005 J. Phys. B: At. Mol. Opt. Phys. 38 4195
[12] [13] Bray I, Stelbovics A T 1992 Phys. Rev. A 46 6995
[14] [15] [16] Pindzola M S, Schultz D R 1996 Phys. Rev. A 53 1525
[17] Bartschat K, Hudson E T, Scott M P, Burke P G, Burke V M 1996 J. Phys. B: At. Mol. Opt. Phys. 29 115
[18] [19] [20] Zatsarinny O, Bartschat K 2011 Phys. Rev. Lett. 107 023203
[21] Madison D H, Al-Hagan O 2010 J. At. Mol. Opt. Phys. 2010 367180
[22] [23] Amaldi U Jr., Egidi A, Marconero R, Pizzella G 1969 Rev. Sci. Instrum 40 1001
[24] [25] Murray A J 2013 Fragmentation Processes: Topics in Atomic and Molecular Physics (London: Cambridge University Press) p164-206
[26] [27] Bransden B H, Joachain C J 1983 Physics of Atoms and Molecules (London: Longman Groups Ltd.) p519
[28] [29] [30] Murray A J
[31] Berakdar J, Briggs J S 1994 Phys. Rev. Lett. 72 3799
[32] [33] [34] Berakdar J, Briggs J S 1994 J. Phys. B: At. Mol. Opt. Phys. 27 4271
[35] [36] Khajuria Y, Tripathi D N 1998 J. Phys. B: At. Mol. Opt. Phys. 31 2359
[37] Bray I, Fursa D V, Röder J, Ehrhardt H 1997 J. Phys. B: At. Mol. Opt. Phys. 30 L101
[38] [39] [40] Stelbovics A T, Bray I, Fursa D V, Bartschat K 2005 Phys. Rev. A 71 052716
[41] Bray I, Lepage T, Fursa D V, Stelbovics A T 2010 J. Phys. B: At. Mol. Opt. Phys. 43 074028
[42] [43] [44] Khajuria Y, Chen L Q, Chen X J, Xu K Z 2002 Phys. Rev. A 65 042706
[45] Yang H, Xing L L, Zhang S M, Wu X J 2011 Acta Phys. Sin. 60 103402 (in Chinese) [杨欢, 邢玲玲, 张穗萌, 吴兴举 2011 物理学报 60 103402]
[46] [47] [48] Sun S Y, Jia X F, Miao X Y, Li X, Ma X Y 2012 Acta Phys. Sin. 61 093402 (in Chinese) [孙世艳, 贾祥富, 苗向阳, 李霞, 马晓艳 2012 物理学报 61 093402]
[49] Chen Z B, Liu L J, Dong C Z 2012 Acta Phys. Sin. 61 143401 (in Chinese) [陈展斌, 刘丽娟, 董晨钟 2012 物理学报 61 143401]
[50] [51] Nixon K L, Murray A J 2013 Phys. Rev. A 87 022712
[52] [53] Tong X M, Lin C D, 2005 J. Phys. B: At. Mol. Opt. Phys. 38 2593
[54] [55] Liu L J, Jia C C, Zhang L M, Chen Z J 2013 Chin. Phys. B 22 103401
[56] [57] Rioual S, Rouvellouy B, Pochat A, Rasch G, Walters H R J, Whelan C T, Allan R J 1997 J. Phys. B: At. Mol. Opt. Phys. 30 L475
[58] [59] Murray A J, Bowring N J, Read F H 2000 J. Phys. B: At. Mol. Opt. Phys. 33 2859
[60] [61] [62] Whelan C T, Walters H R J 1990 J. Phys. B: At. Mol. Opt. Phys. 23 2989
[63] Rioual S, Rouvellou B, Röder J, Pochat A 1997 Coincidence Studies of Electron and Photon Impact Ionization (New York: Plenum Press) p163-167
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