Abstract
Ethylene,the simplest model of a carbon-carbon double bond system,is pivotal in numerous chemical and biological processes.By employing intense infrared laser pump-probe techniques alongside coincidence measure-ments,we investigate the ultrafast non-adiabatic dynamics involved in the breakage of carbon-carbon double bonds and hydrogen elimination in dissociation of ethylene.Our study entails analyzing the dynamic kinetic en-ergy release spectra to assess three bond-breaking scenarios,movements of nuclei,and structural changes around the carbon atoms.This allows us to evaluate the relaxation dynamics and characteristics of various dissociative states.Notably,we observe a significant rise in the yield of fragments resulting from C-H bond breakage with the delay time extended,suggesting non-adiabatic coupling through conical intersections from C-C bond breakage as a probable cause.
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