论文部分内容阅读
The geometric structures and vibration frequencies of para-chlorofluorobenzene (p-ClFPh) in the first excited state of neutral and ground state of cation were investigated by resonance-enhanced multiphoton ionization and slow electron velocity-map imaging.The infrared spectrum of S0 state and absorption spectrum for S1←S0 transition in p-ClFPh were also recorded.Based on the one-color resonant two-photon ionization spectrum and two-color resonant two-photon ionization spectrum,we obtained the adiabatic excited-state energy of p-ClFPh as 36302±4 cm-1.In the two-color resonant two-photon ionization slow electron velocity-map imagin spectra,the accurate adiabatic ionization potential of p-ClFPh was extrapolated as 72937±8 cm-1 via threshold ionization measurement.In addition,Franck-Condon simulation was performed to help us confidently ascertain the main vibrational modes in the S1 and D0 states.Furthermore,the mixing of vibrational modes between S0→S1 and S1→D0 has been analyzed.