title: State-to-state spectroscopy and dynamics of ions and neutrals by photoionization and photoelectron methods.
abstract: Recent advances in high-resolution photoionization, photoelectron, and photodissociation studies based on single-photon vacuum ultraviolet (VUV) and two-color infrared (IR)-VUV, visible (Vis)-ultraviolet (UV), and VUV-VUV laser excitations are illustrated with selected examples. VUV laser photoionization coupled with velocity-map-imaging threshold photoelectron (VMI-TPE) detection can achieve comparable energy resolution but has higher-detection sensitivities than those observed in VUV laser pulsed field ionization photoelectron (PFI-PE) measurements. For molecules with known intermediate states, IR-VUV and Vis-UV excitation schemes are highly sensitive for rovibronically selected and resolved PFI-PE studies. The successful applications of the VUV-PFI-PE, VUV-VMI-TPE, and Vis-UV-PFI-PE methods to state-resolved and state-to-state photoelectron studies of transient radicals and transitional metal-containing molecules are highlighted. The most recently established VUV-VUV pump-probe time-slice VMI photoion method is shown to be promising for state-to-state photodissociation studies of small molecules relevant to planetary atmospheres and for the fundamental understanding of photodissociation dynamics.
authors: Department of Chemistry, University of California, Davis, California 95616; email: cyng@ucdavis.edu.
authors: Cheuk-Yiu
authors: CY
authors: Ng
mesh_terms: D004583:Electrons; D004867:Equipment Design; D007259:Infrared Rays; D007477:Ions / Q000737:chemistry; D007834:Lasers; D008027:Light; D055668:Photochemical Processes; D017785:Photons; D013057:Spectrum Analysis / Q000295:instrumentation* / Q000379:methods; D028561:Transition Elements / Q000737:chemistry; D014466:Ultraviolet Rays
chemical_list: D007477:Ions; D028561:Transition Elements