Direct Observation of Ground-State Product Formation in a 1,3-Cyclohexadiene Ring-Opening Reaction.
Ultrafast photoelectron imaging using a 90 nm vacuum-UV probe pulse is applied to the ring-opening reaction of 1,3-cyclohexadiene (CHD) in the gas phase, and formation of 1,3,5-hexatriene (HT) and CHD in their electronic ground states is observed in real time. The analysis of the transient photoelectron kinetic energy spectra reveals the branching ratio into HT and CHD as 3:7 upon 270 nm photoexcitation. The ratio is in reasonable agreement with the experimental values reported for the liquid phase and theoretical values for the gas phase, resolving the discrepancy.
†Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.|‡RIKEN Center for Advanced Photonics, RIKEN, Wako, 351-0198, Japan.
Shunsuke
S
Adachi
†Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
Motoki
M
Sato
†Department of Chemistry, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.|‡RIKEN Center for Advanced Photonics, RIKEN, Wako, 351-0198, Japan.
Toshinori
T
Suzuki
D053138:Cyclohexenes / Q000737:chemistry*; D004583:Electrons; D005740:Gases / Q000737:chemistry; D008958:Models, Molecular; D008968:Molecular Conformation; D056951:Photoelectron Spectroscopy; D011090:Polyenes / Q000737:chemistry
D053138:Cyclohexenes; D005740:Gases; D011090:Polyenes; C512191:1,3,5-hexatriene; C034005:1,3-cyclohexadiene
1,3,5-hexatriene; conical intersection; imaging; photoelectron spectroscopy; reaction dynamics