| ATOMIC AND MOLECULAR PHYSICS |
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Ultrafast Photodissociation Dynamics of the F State of Sulfur Dioxide by Femtosecond Time-Resolved Pump-Probe Method |
| ZHANG Dong-Dong, NI Qiang, LUO Si-Zuo, ZHANG Jing, LIU Hang, XU Hai-Feng**, JIN Ming-Xing, DING Da-Jun
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Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012
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| Cite this article: |
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ZHANG Dong-Dong, NI Qiang, LUO Si-Zuo et al 2011 Chin. Phys. Lett. 28 033301 |
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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.
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| Keywords:
33.80.-b
33.20.-t
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Received: 23 August 2010
Published: 28 February 2011
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| PACS: |
33.80.-b
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(Photon interactions with molecules)
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33.20.-t
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(Molecular spectra)
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