Ion-Velocity Map Imaging Study of Photodissociation Dynamics of Acetaldehyde |
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| Authors: | Zhi-guo Zhang, Zhi-chao Chen, Cui-mei Zhang, Yan-ling Jin, Qun Zhang, Yang Chen, Cun-shun Huang, Xue-ming Yang |
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| Affiliation: | [1]Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China; [2]State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, China |
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| Abstract: | The photodissociation dynamics of acetaldehyde in the radical channel CH3+HCO has been reinvestigated using time-sliced velocity map imaging technique in the photolysis wavelength range of 275?321 nm. The CH3 fragments have been probed via (2+1) resonance-enhanced multiphoton ionization. Images are measured for CH3 formed in the ground and excited states (v2=0 and 1) of the umbrella vibrational mode. For acetaldehyde dissociation on T1 state after intersystem crossing from S1 state, the products are formed with high translational energy release and low internal excitation. The rotational and vibrational energy of both fragments increases with increasing photodissociation energy. The triplet barrier height is estimated at 3.881±0.006 eV above the ground state of acetaldehyde. |
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| Keywords: | Ion-velocity map imaging Photodissociation dynamics Acetaldehyde |
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