Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (09): 1106-1110.doi: 10.3866/PKU.WHXB20060914

• ARTICLE • Previous Articles     Next Articles

Photodissociation Dynamics of n-C7H15Br Molecule by Ion Velocity Imaging

QU Hong-Bo;LIANG Feng;WEI Zheng-Rong;LI Hai-Yang;ZHANG Bing   

  1. (Anhui Institude of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, P. R. China; 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; Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China; Graduate University of the Chinese Academy of Sciences, Beijing 100049, P. R. China)
  • Received:2006-03-17 Revised:2006-04-20 Published:2006-09-04
  • Contact: ZHANG Bing

Abstract: Photodissociation dynamics of n-C7H15Br molecule was investigated at different wavelengths of 231 to 239 nm by an ion imaging spectrometer operated under optimal conditions for velocity mapping , where the ions were generated from (2+1) resonance enhanced ionization (REMPI) of the photofragments Br(2P3/2) and Br*(2P1/2) at the same wavelength as that of the photolysis laser. The released kinetic energies and the angular distributions of both fragments at different photolysis wavelengths were derived from the three-dimensional velocity images. The probabilities of the individual pathways of the fragments at 234 nm were calculated from the relative quantum yield and angular distribution. The total translational energy distributions were interpreted using soft impulsive model. The anisotropy parameter for Br* is sensitive to the photolysis wavelength. This fact can be explained by the adiabatic and non-adiabatic dissociation processes in the electronically excited states of n-C7H15Br.

Key words: n-C7H15Br, Velocity map ion imaging, Photodissociation dynamics