Femtosecond Resolving Photodissociation Dynamics of the SO2 Molecule
- 16 April 2020
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry Letters
- Vol. 11 (8), 3129-3135
- https://doi.org/10.1021/acs.jpclett.0c00599
Abstract
We experimentally investigate the ultrafast photodissociation dynamics of the SO2 molecule induced by intense ultrashort laser pulses in a pump-probe scheme. Different three-body fragmentation pathways are discriminated using the time-dependent kinetic energy release spectrum with femtosecond time resolution. A nontrivial three-body fragmentation pathway, denoted as the bonding pathway, is unraveled, in which an intermediate fast rotating O-2 molecule is formed before complete fragmentation. The ultrafast chemical bond rearrangement after electron release is tracked in real time. The bonding pathway generally exists in the three-body fragmentation processes induced by strong laser fields of different wavelengths, which is observed in infrared, ultraviolet, and mixed two-color cases. Our findings are significant for understanding the photon-induced ultrafast processes of the SO2 molecule in atmospheric chemistry.Funding Information
- Ministry of Science and Technology of the People's Republic of China (2018YFA0306303)
- Science and Technology Commission of Shanghai Municipality (19JC1412200)
- National Natural Science Foundation of China (11621404, 11761141004, 11834004, 11934004)
- Higher Education Discipline Innovation Project (B12024)
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