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Under the condition of ten different incident energies ranging from 3 eV to 80 eV above the ionization potential of helium and the outgoing electrons having equal energies, by making use of 3C model and modified 3C model, the triple differential cross sections of electron-impact single ionization of the ground state of helium in the perpendicular geometry are calculated. The result is compared with corresponding experimental result to systematically investigate the influences of various screening effects on the triple differential cross sections for helium. The collision mechanisms of the triple differential cross sections are explored. The result shows that the effects of dynamic screening in the final state can directly affect the structures of the triple differential cross sections at lower incident energy, which will unavoidably affect the angular distribution and relative amplitude of side peaks at angles =90 and =270. The screening effects of residual electron in the final state of He+ have a similar significant effect on the amplitude of triple differential cross section of helium and angular distributions and relative amplitudes of side peaks at angles =90 and =270. When the incident energy is over 84.6 eV, the screening effect of residual electron in the final state of He+ has a slight effect on the amplitude of triple differential cross section, which can be overlooked. But the effects of dynamic screening in the final state on side peaks at angles =90 and =270 need considering. In addition, by taking advantage of DS3C-Z model, the results of collision mechanism of various peaks at angles =180, =90 and =270 show that the middle peak at angle =180 is produced by a process called triple scattering mechanism and then the side peaks at angles =90 and =270 are produced by a process called double scattering mechanism. Such a collision mechanism has a direct influence on the generation and variation law of triple differential cross sections.
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Keywords:
- DS3C model /
- perpendicular geometry /
- screening effects /
- collision mechanisms
[1] Harris A L, Esposito T P 2015J. Phys. B:At. Mol. Opt. Phys. 48 215201
[2] Bray I, Guilfoile C J, Kadyrov A S, Fursa D V, Stelbovics A T 2014Phys. Rev. A 90 022710
[3] Abdel-Naby S A, Pindzola M S, Pearce A J, Ballance C P, Loch S D 2015J. Phys. B:At. Mol. Opt. Phys. 48 025203
[4] Kate L, Nixon, Murray A J 2013Phys. Rev. A 87 022712
[5] Cappello C D, Hmouda B, Naja A, Gasaneo G 2013J. Phys. B:At. Mol. Opt. Phys. 46 145203
[6] Yang H, Xing L L, Zhang S M, Wu X J, Yuan H 2013Acta Phys. Sin. 62 183402 (in Chinese)[杨欢, 邢玲玲, 张穂萌, 吴兴举, 袁好2013物理学报62 183402]
[7] Rescigno T N, Baertschy M, Isaacs W A, McCurdy C W 1999Science 286 2474
[8] Zhang X, Whelan C T, Walters H R J 1990J. Phys. B:At. Mol. Opt. Phys. 23 L173
[9] Stelbovics A T, Bray I, Fursa D V, Bartschat K 2005Phys. Rev. A 71 052716
[10] Colgan J, Pindzola M S, Childers G, Khakoo M A 2006Phys. Rev. A 73 042710
[11] Nixon K L, Murray A J, Kaiser C 2010J. Phys. B:At. Mol. Opt. Phys. 43 085202
[12] Brauner M, Briggs J S, Klar H 1989J. Phys. B:At. Mol. Opt. Phys. 22 2265
[13] Zhang S M 2000J. Phys. B:At. Mol. Opt. Phys. 33 3545
[14] Byron F W J, Joachain C J 1966 Phys. Rev. 1461
[15] Berakdar J, Briggs J S 1994 Phys. Rev. Lett. 723799
[16] Gao K, Yang H, Wu X J, Zhang S M 2008 J. At. Mol. Phys. 250683(in Chinese)[高矿, 杨欢, 吴兴举, 张穂萌2008原子与分子物理学报25 0683]
[17] Berakdar J, Briggs J S 1994 J. Phys. B:At. Mol. Opt. Phys. 274271
[18] Al-Hagan O, Kaiser C, Madison D, Murray A J 2009Nat. Phys. 5 59
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[1] Harris A L, Esposito T P 2015J. Phys. B:At. Mol. Opt. Phys. 48 215201
[2] Bray I, Guilfoile C J, Kadyrov A S, Fursa D V, Stelbovics A T 2014Phys. Rev. A 90 022710
[3] Abdel-Naby S A, Pindzola M S, Pearce A J, Ballance C P, Loch S D 2015J. Phys. B:At. Mol. Opt. Phys. 48 025203
[4] Kate L, Nixon, Murray A J 2013Phys. Rev. A 87 022712
[5] Cappello C D, Hmouda B, Naja A, Gasaneo G 2013J. Phys. B:At. Mol. Opt. Phys. 46 145203
[6] Yang H, Xing L L, Zhang S M, Wu X J, Yuan H 2013Acta Phys. Sin. 62 183402 (in Chinese)[杨欢, 邢玲玲, 张穂萌, 吴兴举, 袁好2013物理学报62 183402]
[7] Rescigno T N, Baertschy M, Isaacs W A, McCurdy C W 1999Science 286 2474
[8] Zhang X, Whelan C T, Walters H R J 1990J. Phys. B:At. Mol. Opt. Phys. 23 L173
[9] Stelbovics A T, Bray I, Fursa D V, Bartschat K 2005Phys. Rev. A 71 052716
[10] Colgan J, Pindzola M S, Childers G, Khakoo M A 2006Phys. Rev. A 73 042710
[11] Nixon K L, Murray A J, Kaiser C 2010J. Phys. B:At. Mol. Opt. Phys. 43 085202
[12] Brauner M, Briggs J S, Klar H 1989J. Phys. B:At. Mol. Opt. Phys. 22 2265
[13] Zhang S M 2000J. Phys. B:At. Mol. Opt. Phys. 33 3545
[14] Byron F W J, Joachain C J 1966 Phys. Rev. 1461
[15] Berakdar J, Briggs J S 1994 Phys. Rev. Lett. 723799
[16] Gao K, Yang H, Wu X J, Zhang S M 2008 J. At. Mol. Phys. 250683(in Chinese)[高矿, 杨欢, 吴兴举, 张穂萌2008原子与分子物理学报25 0683]
[17] Berakdar J, Briggs J S 1994 J. Phys. B:At. Mol. Opt. Phys. 274271
[18] Al-Hagan O, Kaiser C, Madison D, Murray A J 2009Nat. Phys. 5 59
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