TITLE

Scattering angular distributions in collisionally activated dissociation of some high mass ions: Analysis of mass-analyzed ion kinetic energy peak shapes

AUTHOR(S)
Lee, Young Jin; Kim, Myung Soo
PUB. DATE
October 1995
SOURCE
Journal of Chemical Physics;10/1/1995, Vol. 103 Issue 13, p5442
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A method has been developed to determine scattering angular distribution in collisionally activated dissociation (CAD) of high mass ions by analyzing translational energy spectra recorded by mass-analyzed ion kinetic energy spectrometry. Scattering angular distributions have been obtained for CAD of C6F5I+, Cr(CH3COCHCOCH3)+3, and Cs5I+4 with He. Large energy losses observed in the translational energy spectra are attributed to the elastic energy transfer to the collision gas accompanying collisional deflection. Deflections of the parent ions get larger as the translational energy for relative motion in the center-of-mass coordinate system decreases. This has been explained by the reactive line-of-centers model. Either vibrational excitation via momentum transfer or vibronic excitation via nonadiabatic interaction is compatible with the experimental data. On the other hand, electronic excitation via the Franck–Condon process is not a feasible mechanism to explain the excitation process in CAD of high mass ions at keV translational energy. © 1995 American Institute of Physics.
ACCESSION #
7647579

 

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