文档介绍：Energy and angular distributions in dissociative photodetachment of O 4 2 C. R. Sherwood, M. C. Garner, K. A. Hanold, K. M. Strong, and R. E. ti Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0314 ~Received 20 January 1995; accepted 24 February 1995 ! An anisotropic product angular distribution has been observed in the dissociative photodetachment of O 4 2at 523 nm. Energy and angular distributions of coincident O 2products from the process O 4 2 1 h n → O 2 1 O 2 1 e 2were measured using translational energy spectroscopy in a fast ion beam. The angular distribution peaks perpendicular to the electric vector of the laser beam. ? 1995 American Institute of Physics. Analyses of product energy and angular distributions have provided important insights into the dynamics of both bimolecular and unimolecular chemical reactions. In the case of photodissociation, it has been shown 1,2 that product angu- lar distributions are affected by excited state lifetimes, mo- lecular structure and electronic symmetry. Anisotropic prod- uct angular distributions have been observed in dissociative photoionization, 3 dissociative electron-impact ionization, 4 and dissociative electron attachment to neutral molecules. 5 An anisotropic distribution of molecular axes is also ex- pected to be produced in photodetachment of a n