Photodissociation of (ICN) 2 van der Waals dimer using velocity imaging technique
Journal
Journal of Chemical Physics
Journal Volume
130
Journal Issue
21
Date Issued
2009
Author(s)
Zhang, X.-P.
Lee, W.-B.
Zhao, D.-F.
Hsiao, M.-K.
Chen, Y.-L.
KING-CHUEN LIN
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.
SDGs
Type
journal article