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Citation: CHEN Yin, ZHANG Chang-Hua, CAO Zhen-Zhou, ZHANG Bing. UV Photodissociation Dynamics of C6H11Br by Velocity Map Ion Imaging[J]. Acta Physico-Chimica Sinica, ;2008, 24(05): 844-848. doi: 10.3866/PKU.WHXB20080519 shu

UV Photodissociation Dynamics of C6H11Br by Velocity Map Ion Imaging

1.
State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China; Graduate School of the Chinese Academy of Sciences, Beijing 100049, P. R. China

Received Date: 15 November 2007
Available Online: 21 January 2008

The Photodissociation dynamics of C6H11Br was investigated near 234 nm. A two-dimensional photofragment ion-velocity imaging technique coupled with a (2+1) resonance-enhancedmultiphoton (REMPI) ionization scheme was utilized to obtain the angular and translational energy distributions of the nascent Br(2P3/2) and Br*(2P1/2) atoms. The relative quantum yields were obtained from (2+1) resonance-enhanced multiphoton ionization (REMPI) of the photofragment Br*(2P1/2) and Br(2P3/2). It was suggested that Br* came fromthe direct dissociation of S1 state mostly, while Br atom was produced by non-adiabatic transition between the S2 and T3 states. Consequently, the higher internal energy distribution and the broader translational energy distribution of Br channel than those of Br* formation channel can be explained well. The results indicated that a large fraction of the available energy translated into the internal energy of the fragments, which can be explained using the soft impulsive model. However, comparing with other long-chain bromoalkane, more available energy was translated into the kinetic energy. The relationship between the energy partition and the cyclohexyl radical structure were analyzed.
- C6H11Br; Photodissociation dynamics; Velocity map ion imaging; REMPI
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沈阳化工大学材料科学与工程学院沈阳 110142

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