title: Photodissociation of (ICN)(2) van der Waals dimer using velocity imaging technique.
abstract: Photodissociation of (ICN)(2) dimer from 265 to 270 nm are studied using time-of-flight mass spectrometry combined with velocity imaging technique. Both I(+) and I(2) (+) ions are found in the mass spectra. The I(2) (+) ions result from (1+1) resonant ionization of the neutral I(2) fragment that is produced in the photodissociation of dimer, but not from dissociative ionization of (ICN)(2); i.e., (ICN)(2) (+)+hnu-->I(2) (+)+2CN. The dissociation channels of I(2) (+) leading to I(+) are all found with parallel character. The total kinetic energy distributions and anisotropy parameters of the I(+) channels produced by (ICN)(2) are almost the same as those from a neutral I(2) sample, thereby confirming that the I(2) fragments are obtained in cold state. With the aid of ab initio calculations, a plausible dissociation mechanism is proposed.
authors.affiliation: Department of Chemistry, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Xiao-peng
authors.initials: XP
authors.lastname: Zhang
authors.forename: Wei-Bin
authors.initials: WB
authors.lastname: Lee
authors.forename: Dong-feng
authors.initials: DF
authors.lastname: Zhao
authors.forename: Ming-Kai
authors.initials: MK
authors.lastname: Hsiao
authors.forename: Yu-Ling
authors.initials: YL
authors.lastname: Chen
authors.forename: King-Chuen
authors.initials: KC
authors.lastname: Lin