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Depletion of atmospheric ozone layers is more and more serious. Alkyl halides dissociate under the solar UV radiation with the product of free halogen atoms, which greatly damages the ozone layer and is the main culprit for the depletion of ozone layers. In this paper, methyl iodide is chosen as a calibration system of velocity map imaging. Velocity map images of iodine atom I (2P3/2) at different focus voltages are obtained in the dissociation of methyl iodine under an UV radiation of ～266 nm by techniques of velocity map imaging and REMPI (Resonance Enhanced Multiphoton Ionization). The magnification factor N of velocity map imaging system is measured to be 1.13. Photodissociation dynamics of 1, 4-C4H8BrCl under an UV radiation of ～234 nm is investigated on this velocity map imaging system. The speed and angular distributions of the fragments Br(2P3/2) and Br* (2P1/2) atoms in the dissociation are obtained and analyzed. Experimental results suggest that the dissociation of 1, 4-C4H8BrCl to both Br(2P3/2) and Br* (2P1/2) atoms under an UV radiation of ～234 nm happens promptly along the C-Br bond via repulsive surfaces after excitation. The anisotropy coefficient values are obtained from angular distributions of imaging of the fragments Br (2P3/2) and Br* (2P1/2) atoms, by which the ratio between perpendicular transition and parallel transition for those two dissociation channels are calculated. In addition, photodissociation mechanisms of CH2BrCl, 1, 2-C2H4BrCl, 1, 3-C3H6BrCl and 1, 4-C4H8BrCl at an UV radiation of ～234 nm are compared, and the dependences of dissociation mechanisms of dihalogen alkyl compounds on size of the alkyl radical are obtained.
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Keywords:
- 1,4-C4H8BrCl /
- photodissociation /
- velocity map imaging /
- system calibration
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[3] Butler J H, Battle M, Bender M L, Montzka S A, Clarke A D, Saltzman E S, Sucher C M, Severinghaus J P, Elkins J W 1999 Nature 399 749
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[6] Tzeng W B, Lee Y R, Lin S M 1994 Chem. Phys. Lett. 227 467
[7] Stevens J E, Kitchen D C, Waschewsky G C G, Butler L J 1995J. Chem. Phys. 102 3179
[8] Wang G J, Zhang H, Zhu R S, Han K L, He G Z, Lou N Q 1999 Chem. Phys. 241 213
[9] Xu H F, Liu S L, Ma X X, Dai D X, Xie J C, Sha G H 2002 Acta Phys. Sin. 51 240 (in Chinese) [徐海峰, 刘世林, 马兴孝, 戴东旭, 觧金春, 沙国河 2002物理学报 51 240]
[10] Rozgonyi T, Gonzalez L 2002 J. Phys. Chem. A 106 11150
[11] Huang C Q, Wei L X, Yang B, Yang R, Wang S S, Shan X B, Qi F, Zhang Y W, Sheng L S, Hao L Q, Zhou S K, Wang Z Y 2006 Acta Phys. Sin. 55 1083 (in Chinese) [黄超群, 卫立夏, 杨斌, 王思胜, 单晓斌, 齐飞, 张允武, 盛六四, 郝立庆, 周士康, 王振亚 2006 物理学报 55 1083]
[12] Zhou J G, Lau K C, Hassanein E, Xu H F, Tian S X, Jones B, Ng C Y 2006 J. Chem. Phys. 124 34309
[13] Li R, Yan B, Zhao S T, Guo Q Q, Lian K Y, Tian C J, Pan S F 2008 Acta Phys. Sin. 57 4130 (in Chinese) [李瑞, 闫冰, 赵书涛, 郭庆群, 连科研, 田传进, 潘宋甫 2008 物理学报 57 4130]
[14] Lee S H, Jung Y J, Jung K H 2000 Chem. Phys. 260 143
[15] McGivern W S, Li R, Zou P, North S W 1999 J. Chem. Phys. 111 5771
[16] Lee K S, Paul D, Hong K, Cho Y N, Jung K W, Kim, T K 2009 Bull. Korean Chem. Soc. 30 2962
[17] Hua L, Shen H, Zhang C, Cao Z, Zhang B 2008 Chem. Phys. Lett. 460 50
[18] Wei Z, Wang Y, Zheng Q, Zhao Z, Zhang B 2008 Opt. Commun. 281 287
[19] Eppink A T J B, Parker D H 1997 Rev. Sci. Instrum. 68 3477
[20] Parker D H, Eppink A T J B 1997 J. Chem. Phys. 107 2357
[21] Liu Y, Tang B, Shen H, Zhang S, Zhang B 2010 Opt. Express 18 5791
[22] Guo H, Schatz G C 1999 J. Chem. Phys. 93 393
[23] Jung Y J, Kim Y S, Kang W K, Jung K H 1997 J. Chem. Phys. 107 7187
[24] Eppink A T J B, Parker D H 1999 J. Chem. Phys. 110 832
[25] Wentworth W E, George R, Keith H 1969 J. Chem. Phys. 51 1791
[26] Jung Y J, Park M S, Kima Y S, Jung K H, Volpp H R 1999 J. Chem. Phys. 111 4005
[27] Busch G E, Wilson K R 1972 J. Chem. Phys. 56 3638
[28] Mulliken R S 1940 J. Chem. Phys. 8 382
[29] Zhu Q H, Cao J R, Wen Y, Zhang J M, Zhong X, Huang Y H, Fang W Q, Wu X J 1988 Chem. Phys. Lett. 144 486
[30] Liu Y, Zhang Q, Zhang Y, Zhang R, Wang Y, Zhang B 2009 Chem. Phys. Chem. 10 830
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[1] Chang J S, Duewer W M 1979 Annu. Rev. Phys. Chem. 30 443
[2] Wang D S, Kim M S, Choe J C, Ha T K 2001 J. Chem. Phys. 115 5454
[3] Butler J H, Battle M, Bender M L, Montzka S A, Clarke A D, Saltzman E S, Sucher C M, Severinghaus J P, Elkins J W 1999 Nature 399 749
[4] Krajnovich D, Butler L J, Lee Y T 1984 J. Chem. Phys. 81 3031
[5] Butler L J, Hintsa E J, Shane S F, Lee Y T 1987 J. Chem. Phys. 86 2051
[6] Tzeng W B, Lee Y R, Lin S M 1994 Chem. Phys. Lett. 227 467
[7] Stevens J E, Kitchen D C, Waschewsky G C G, Butler L J 1995J. Chem. Phys. 102 3179
[8] Wang G J, Zhang H, Zhu R S, Han K L, He G Z, Lou N Q 1999 Chem. Phys. 241 213
[9] Xu H F, Liu S L, Ma X X, Dai D X, Xie J C, Sha G H 2002 Acta Phys. Sin. 51 240 (in Chinese) [徐海峰, 刘世林, 马兴孝, 戴东旭, 觧金春, 沙国河 2002物理学报 51 240]
[10] Rozgonyi T, Gonzalez L 2002 J. Phys. Chem. A 106 11150
[11] Huang C Q, Wei L X, Yang B, Yang R, Wang S S, Shan X B, Qi F, Zhang Y W, Sheng L S, Hao L Q, Zhou S K, Wang Z Y 2006 Acta Phys. Sin. 55 1083 (in Chinese) [黄超群, 卫立夏, 杨斌, 王思胜, 单晓斌, 齐飞, 张允武, 盛六四, 郝立庆, 周士康, 王振亚 2006 物理学报 55 1083]
[12] Zhou J G, Lau K C, Hassanein E, Xu H F, Tian S X, Jones B, Ng C Y 2006 J. Chem. Phys. 124 34309
[13] Li R, Yan B, Zhao S T, Guo Q Q, Lian K Y, Tian C J, Pan S F 2008 Acta Phys. Sin. 57 4130 (in Chinese) [李瑞, 闫冰, 赵书涛, 郭庆群, 连科研, 田传进, 潘宋甫 2008 物理学报 57 4130]
[14] Lee S H, Jung Y J, Jung K H 2000 Chem. Phys. 260 143
[15] McGivern W S, Li R, Zou P, North S W 1999 J. Chem. Phys. 111 5771
[16] Lee K S, Paul D, Hong K, Cho Y N, Jung K W, Kim, T K 2009 Bull. Korean Chem. Soc. 30 2962
[17] Hua L, Shen H, Zhang C, Cao Z, Zhang B 2008 Chem. Phys. Lett. 460 50
[18] Wei Z, Wang Y, Zheng Q, Zhao Z, Zhang B 2008 Opt. Commun. 281 287
[19] Eppink A T J B, Parker D H 1997 Rev. Sci. Instrum. 68 3477
[20] Parker D H, Eppink A T J B 1997 J. Chem. Phys. 107 2357
[21] Liu Y, Tang B, Shen H, Zhang S, Zhang B 2010 Opt. Express 18 5791
[22] Guo H, Schatz G C 1999 J. Chem. Phys. 93 393
[23] Jung Y J, Kim Y S, Kang W K, Jung K H 1997 J. Chem. Phys. 107 7187
[24] Eppink A T J B, Parker D H 1999 J. Chem. Phys. 110 832
[25] Wentworth W E, George R, Keith H 1969 J. Chem. Phys. 51 1791
[26] Jung Y J, Park M S, Kima Y S, Jung K H, Volpp H R 1999 J. Chem. Phys. 111 4005
[27] Busch G E, Wilson K R 1972 J. Chem. Phys. 56 3638
[28] Mulliken R S 1940 J. Chem. Phys. 8 382
[29] Zhu Q H, Cao J R, Wen Y, Zhang J M, Zhong X, Huang Y H, Fang W Q, Wu X J 1988 Chem. Phys. Lett. 144 486
[30] Liu Y, Zhang Q, Zhang Y, Zhang R, Wang Y, Zhang B 2009 Chem. Phys. Chem. 10 830
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