The photodissociation dynamics of m-bromofluorobenzene has been experimentally investigated at around 240 nm using the DC-slice velocity map imaging technique. The kinetic energy release spectra and the recoiling angular distributions of fragmented Br(2P3/2) and Br(2P1/2) atoms from photodissociation of m-bromofluorobenzene have been measured at different photolysis wavelengths around 240 nm. The experimental results indicate that two dissociation pathways via (pre-)dissociation of the two low-lying 1ππ* excited states dominate the production process of the ground state Br(2P3/2) atoms. Because of the weak spin-orbit coupling effect among the low-lying triplet and singlet states, the spin-orbit excited Br(2P1/2) atoms are mainly produced via singlet-triplet state coupling in the dissociation step. The similarity between the present results and that recently reported for o-bromofluorobenzene indicates that the substitution position of the fluorine atom does not significantly affect the UV photodissociation dynamics of bromofluorobenzenes.
Ultraviolet photodissociation dynamics of m-bromofluorobenzene at around 240 nm†
Min Chen, Hao Liang, Chao He, Dong-feng Zhao, Yang Chen; Ultraviolet photodissociation dynamics of m-bromofluorobenzene at around 240 nm. Chin. J. Chem. Phys. 1 August 2018; 31 (4): 563–567. https://doi.org/10.1063/1674-0068/31/CJCP1806136
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