摘要A femtosecond pump-probe method is employed to study the dissociation dynamics of sulfur dioxide. SO2 molecules are excited to the F state by absorbing two photons of 267 nm femtosecond laser pulses, and ionized by 400 nm laser pulses at different delay times between the two lasers. Transients of both parent ions (SO2+) and the fragment ions (SO+, S+ and O+) are observed. The SO2+ transient can be well fitted to a biexponential decay comprising a fast and a slow component of 280 fs and 2.97 ps lifetimes, respectively. The SO+ transient consists of two growth components of 270 fs and 2.50 ps. The results clearly show that the F state of SO2 dissociates along an S−O bond. The transients of S+ and O+, however, have different behavior, which consist of a fast growth and a long decay component. A possible mechanism of the fragment formation is discussed to understand the dissociation dynamics of the F state of SO2.
Abstract：A femtosecond pump-probe method is employed to study the dissociation dynamics of sulfur dioxide. SO2 molecules are excited to the F state by absorbing two photons of 267 nm femtosecond laser pulses, and ionized by 400 nm laser pulses at different delay times between the two lasers. Transients of both parent ions (SO2+) and the fragment ions (SO+, S+ and O+) are observed. The SO2+ transient can be well fitted to a biexponential decay comprising a fast and a slow component of 280 fs and 2.97 ps lifetimes, respectively. The SO+ transient consists of two growth components of 270 fs and 2.50 ps. The results clearly show that the F state of SO2 dissociates along an S−O bond. The transients of S+ and O+, however, have different behavior, which consist of a fast growth and a long decay component. A possible mechanism of the fragment formation is discussed to understand the dissociation dynamics of the F state of SO2.
ZHANG Dong-Dong;NI Qiang;LUO Si-Zuo;ZHANG Jing;LIU Hang;XU Hai-Feng**;JIN Ming-Xing;DING Da-Jun
. Ultrafast Photodissociation Dynamics of the F State of Sulfur Dioxide by Femtosecond Time-Resolved Pump-Probe Method[J]. 中国物理快报, 2011, 28(3): 33301-033301.
ZHANG Dong-Dong, NI Qiang, LUO Si-Zuo, ZHANG Jing, LIU Hang, XU Hai-Feng**, JIN Ming-Xing, DING Da-Jun
. Ultrafast Photodissociation Dynamics of the F State of Sulfur Dioxide by Femtosecond Time-Resolved Pump-Probe Method. Chin. Phys. Lett., 2011, 28(3): 33301-033301.
[1] Yamanouchi K, Okunishi M and Endo Y 1995 J. Mol. Struct. 352/353 541
[2] Corofret B R, Dylewski S M and Houston P L 2000 J. Phys. Chem . A 104 10240
[3] Ran H, Xie D and Guo H 2007 Chem. Phys. Lett. 439 280
[4] Zhang G, Zhang L and Jin Y 2010 Spectrochim. ACTA A 77 141
[5] Tokue I and Nanbu S 2010 J. Chem. Phys. 132 024301
[6] Suto M, Day R L and Lee L C 1982 J. Phys. B 15 4165
[7] Foo V Y, Brion C E and Hasted J B 1971 Proc. R. Soc. London A 322 535
[8] Zhang L, Pei L, Dai J, Zhang T, Chen C, Yu S and Ma X 1996 Chem. Phys Lett. 259 403
[9] Xue B, Chen Y and Dai H, 2000 J. Chem. Phys. 112 2210
[10] Dixit A A, Lei Y, Lee K W, Quinones E and Houston P L 2005 J. Phys. Chem. A 109 1770
[11] Scherer N F, Knee J L, Smith D D and Zewail A H 1985 J. Phys. Chem. 89 5141
[12] Wisniewski E S and Castleman A W Jr 2002 J. Phys. Chem. A 106 10843
[13] Kanappenberger K L Jr and Castleman A W Jr 2004 J. Chem. Phys. 121 3540
[14] Hydutsky D P, Bianco N J and Castleman A W Jr 2008 Chem. Phys. 350 212
[15] Hurley S M, Dermota T E, Hydutsky D P and Castleman A W Jr 2003 J. Phys. Chem. A 107 3497
[16] Dermota T E, Hydutsky D P, Bianco N J and Castleman A W Jr 2005 J. Phys. Chem. A 109 8254
[17] Dermota T E, Hydutsky D P, Bianco N J and Castleman A W Jr 2005 J. Phys. Chem. A 109 8259
[18] Zhang X, Zhang D, Liu H, Xu H, Jin M and Ding D 2010 J. Phys. B 43 025102
[19] Fiebig T, Chachisvilis M, Manger M, Zewail A H, Douhal A, Garcia-Ochoa I and Ayuso A d L H 1999 J. Phys. Chem. A 103 7419
2011, Vol. 28 
