The design of double electrostatic-lens optics for resonance enhanced multiphoton ionization and photoelectron imaging experiments

• DOI: 10.1063/1.4922521
• Publication Date: 2015-06-16T17:38:25Z
• Authors: Zehua Qu; Chunsheng Li; Zhengbo Qin; Xianfeng Zheng; Guanxin Yao; Xianyi Zhang; Zhifeng Cui
• Keywords: Resonance-enhanced multiphoton ionization; Photoexcitation

Compared to single ion/electron-optics for velocity-map imaging, a double-focusing lens assembly designed not only allows mapping velocity imaging of photoelectrons but also investigating the vibrational structure intermediate states neutral species in resonance enhanced multiphoton ionization (REMPI) spectra. In this presentation, order record REMPI and photoelectron spectra separately, we have constructed compact (VMI) apparatus combined with an opposite linear Wiley-Mclaren time-of-flight mass spectrometer (TOFMS). A resolution (m/Δm) ∼1300 TOFMS electron energy (ΔE/E) 2.4% VMI been achieved upon three-photon Xe atom at 258.00 nm laser wavelength. As benchmark, combination one-color (1 + 1) benzene via 61 6111 vibronic levels S1 state, structures cation angular anisotropy are unraveled. addition, two-color 1′) aniline was used complete accurate measurement potential (62 271 ± 3 cm−1). The results suggest that is powerful tool studying photoionization dynamics using vibrational-state selected excitation neutrals based on technique.