Browsing by Author "Shiu, W"

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Imaging the pair-correlated excitation function: The F+CH4 -> HF(v ')+CH3 (nu=0) reaction
(2004-01-01)
Shiu, W
;
Lin, JJ
;
Liu, KP
;
Wu, M
;
Parker, DH
The velocity map ion imaging technique was applied to measure the reaction excitation function for the first time. It was found that the "raw" excitation function was significantly distorted by the density-to-flux transformation of the title reaction. Through a systematic investigation, possible reasons for such a dramatic effect are outlined. In addition, the state-resolved, pair-correlated excitation functions and branching ratios are presented. Effects of imperfect time slicing in the time-sliced velocity imaging technique in general are also discussed. (C) 2004 American Institute of Physics.
Reactive resonance in a polyatomic reaction
(2004-03-12)
Shiu, W
;
Lin, JJ
;
Liu, KP
;
應用化學系
;
Department of Applied Chemistry
In the course of an extensive investigation aimed at understanding the detailed mechanisms of a prototypical polyatomic reaction, several remarkable observations were uncovered. To interpret these findings, we surmise the existence of a reactive resonance in this polyatomic reaction. The reaction of concern is F+CH4-->HF+CH3, and the abnormal attributes were revealed only near the reaction threshold. The discovery of reactive resonance in a polyatomic reaction is more than just an extension from a typical atom+diatom reaction. As shown here, it holds great promise to disentangle the elusive intramolecular vibrational dynamics of transient collision complex in the critical transition-state region.