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The dissociative ionization process of methane induced by 54eV electron impact is investigated using an advanced reaction microscope. In the present paper, our attention is specially paid to the kinetic energy distributions of the CH+2,CH+ and C+ fragments. Energy deposition spectra are presented for these fragments of different kinetic energies. It is shown that the dissociations from the (2a1) -1 and (1t2) -2(3a1) states of CH+4 are the dominant contributions of the CH+2, CH+ and C+ fragments. The kinetic energy of fragment is sensitive to the electronic state of its parent ion. Fragment ions with kinetic energies lower than 0.1 eV are mainly from the dissociation of (2a1) -1 state, and partly from the dissociation of (1t2) -2(3a1) state; the ions with energies between 0.1 eV and 0.3 eV are contrituted equally by the two states; the ions with energies higher than 0.4 eV are formed dominantly from the dissociation of (1t2) -2(3a1) state.
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Keywords:
- reaction microscope /
- dissociative ionization /
- energy deposition /
- kinetic energy distribution
[1] Liu X, Shemansky D E 2006 J. Geophys. Res. 111 A04303
[2] Gluch K, Scheier P, Schustereder W, Tepnual T, Feketeova L, Mair C, Matt-Leubner S, Stamatovic A, Märk T D 2003 Int. J. Mass. Spectrom. 228 307
[3] Tian C, Vidal C R 1998 J. Phys. B: At. Mol. Opt. Phys. 31 895
[4] Straub H C, Lin D, Lindsay B G, Smith K A, Stebbings R F 1997 J. Chem. Phys. 106 4430
[5] 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辑)38 1]
[6] Ullrich J, Moshammer R, Dorn A, Dörner R, Schmidt L P H, Schmidt-Böcking H 2003 Rep. Prog. Phys. 66 1463
[7] Zhu X L, Ma X W, Li B, Liu H P, Chen L F, Zhang S F, Feng W T 2009 Acta.Phys. 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 物理学报 58 2077]
[8] Zhang S F, Ma X W, Liu H P, Li B, Zhu X L 2006 Sci. China G 36 456 (in Chinese) [张少锋、 马新文、 刘惠萍、 李 斌、 朱小龙 2006 中国科学 (G辑) 36 456]
[9] Senftleben A, Pflüger T, Ren X, Al-Hagan O, Najjari B, Madison D, Dorn A, Ullrich J 2010 J. Phys. B: At. Mol. Opt. Phys. 43 081002
[10] Dürr M, Dimopoulou C, Najjari B, Dorn A, Ullrich J 2006 Phys. Rev. Lett. 96 243202
[11] Xu S Y, Ma X W, Yan S C, Zhu X L, Zhang S F, Feng W T, Li B, Meng L J 2009 Nuclear Electronics & Detection Technology 29 96 (in Chinese) [许慎跃、 马新文、 闫顺成、 朱小龙、 刘惠萍、 张少锋、 冯文天、 李 斌、 孟令杰 2009 核电子学与探测技术 29 96]
[12] 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 物理学报 56 3637]
[13] Feng W T, Ma X W, Zhu X L, Zhang S F, Liu H P, Xu S Y, Qian D B, Li B, Yan S C, Zhang D C, Meng L J, Zhang P J 2010 Acta. Phys. Sin. 59 8471 (in Chinese) [冯文天、 马新 文、 朱小龙、 张少锋、 刘惠萍、 许慎跃、 钱东斌、 李 斌、 闫顺成、 张大成、 孟令杰、 张鹏举 2010 物理学报 59 8471]
[14] Fukuzawa H, Odagiri T, Nakazato T, Murata M, Miyagi H, Kouchi N 2005 J. Phys. B: At. Mol. Opt. Phys. 38 565
[15] Yachi K, Odagiri T, Ishikawa L, Nakazato T, Tsuchida T, Ohno N, Kitajima M, Kouchi N 2010 J. Phys. B: At. Mol. Opt. Phys. 43 155208
[16] Dutuit O, At-Kaci M, Lemaire J, Richard-Viard M 1990 Phys. Scr. T31 223
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[1] Liu X, Shemansky D E 2006 J. Geophys. Res. 111 A04303
[2] Gluch K, Scheier P, Schustereder W, Tepnual T, Feketeova L, Mair C, Matt-Leubner S, Stamatovic A, Märk T D 2003 Int. J. Mass. Spectrom. 228 307
[3] Tian C, Vidal C R 1998 J. Phys. B: At. Mol. Opt. Phys. 31 895
[4] Straub H C, Lin D, Lindsay B G, Smith K A, Stebbings R F 1997 J. Chem. Phys. 106 4430
[5] 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辑)38 1]
[6] Ullrich J, Moshammer R, Dorn A, Dörner R, Schmidt L P H, Schmidt-Böcking H 2003 Rep. Prog. Phys. 66 1463
[7] Zhu X L, Ma X W, Li B, Liu H P, Chen L F, Zhang S F, Feng W T 2009 Acta.Phys. 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 物理学报 58 2077]
[8] Zhang S F, Ma X W, Liu H P, Li B, Zhu X L 2006 Sci. China G 36 456 (in Chinese) [张少锋、 马新文、 刘惠萍、 李 斌、 朱小龙 2006 中国科学 (G辑) 36 456]
[9] Senftleben A, Pflüger T, Ren X, Al-Hagan O, Najjari B, Madison D, Dorn A, Ullrich J 2010 J. Phys. B: At. Mol. Opt. Phys. 43 081002
[10] Dürr M, Dimopoulou C, Najjari B, Dorn A, Ullrich J 2006 Phys. Rev. Lett. 96 243202
[11] Xu S Y, Ma X W, Yan S C, Zhu X L, Zhang S F, Feng W T, Li B, Meng L J 2009 Nuclear Electronics & Detection Technology 29 96 (in Chinese) [许慎跃、 马新文、 闫顺成、 朱小龙、 刘惠萍、 张少锋、 冯文天、 李 斌、 孟令杰 2009 核电子学与探测技术 29 96]
[12] 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 物理学报 56 3637]
[13] Feng W T, Ma X W, Zhu X L, Zhang S F, Liu H P, Xu S Y, Qian D B, Li B, Yan S C, Zhang D C, Meng L J, Zhang P J 2010 Acta. Phys. Sin. 59 8471 (in Chinese) [冯文天、 马新 文、 朱小龙、 张少锋、 刘惠萍、 许慎跃、 钱东斌、 李 斌、 闫顺成、 张大成、 孟令杰、 张鹏举 2010 物理学报 59 8471]
[14] Fukuzawa H, Odagiri T, Nakazato T, Murata M, Miyagi H, Kouchi N 2005 J. Phys. B: At. Mol. Opt. Phys. 38 565
[15] Yachi K, Odagiri T, Ishikawa L, Nakazato T, Tsuchida T, Ohno N, Kitajima M, Kouchi N 2010 J. Phys. B: At. Mol. Opt. Phys. 43 155208
[16] Dutuit O, At-Kaci M, Lemaire J, Richard-Viard M 1990 Phys. Scr. T31 223
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