title: Ultrafast dynamics of o-bromofluorobenzene studied by time-resolved photoelectron imaging.
abstract: Photodissociation dynamics and rotational wave packet coherences of o-bromofluorobenzene are studied by femtosecond time-resolved photoelectron imaging [figure: see text]. The decay of different photoelectron rings shows the population decay of states from which the lifetimes of different states are determined. The variation of photoelectron angular distributions reflects the evolution of rotational coherences.Photodissociation dynamics and rotational wave packet coherences of o-bromofluorobenzene are studied by femtosecond time-resolved photoelectron imaging (TR-PEI) spectroscopy combined with the (1+2') resonance-enhanced multiphoton ionization (REMPI). Photoelectron kinetic energy and angular distributions indicate ionization dynamics from some Rydberg states at the (1+1') photon energy. The lifetimes of the S(1) (A') and T(2) (A') states are determined from the decay of the photoelectron signals to be 38 ps and 27 ps. The electron population decay of the two states is attributed to predissociation and tunneling dissociation. The variation of time-dependent anisotropy parameters in the first 5 ps shows the rotational wave coherences of molecule.
authors.affiliation: State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, PR China.
authors.forename: Zhen-Zhou
authors.initials: ZZ
authors.lastname: Cao
authors.forename: Zheng-Rong
authors.initials: ZR
authors.lastname: Wei
authors.forename: Lin-Qiang
authors.initials: LQ
authors.lastname: Hua
authors.forename: Chang-Jin
authors.initials: CJ
authors.lastname: Hu
authors.forename: Song
authors.initials: S
authors.lastname: Zhang
authors.forename: Bing
authors.initials: B
authors.lastname: Zhang