title: Photoelectron imaging and (2 + 1) resonance enhanced multiphoton ionization spectroscopy study of 2-butanone photoionization dynamics.
abstract: (2 + 1) Resonance enhanced multiphoton ionization (REMPI) spectra were recorded for 2-butanone to study its photoionization dynamics. Two-photon excitation (53,200-55,000 cm(-1) and 57,000-59,500 cm(-1)) was used to prepare the molecule in the 3s and 3p Rydberg states, respectively. Vibrational transitions in the spectrum were assigned with the aid of ab initio calculations as well as photoelectron imaging results. Photoelectron imaging data in the 3s Rydberg region exhibits a vibrational progression in the CCOC deformation mode in the ionic state superimposed on an otherwise diagonal (delta v = 0) ionization. Photoelectron imaging data in the 3p Rydberg region shows 3p-3s Rydberg-Rydberg mixing. The ionization energy obtained directly from the 3p photoelectron imaging is 9.541 eV.
authors.affiliation: Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, USA.
authors.forename: Lei
authors.initials: L
authors.lastname: Shen
authors.forename: Bailin
authors.initials: B
authors.lastname: Zhang
authors.forename: Arthur G
authors.initials: AG
authors.lastname: Suits
mesh_terms: D002074:Butanones / Q000737:chemistry*; D003198:Computer Simulation; D008956:Models, Chemical; D010777:Photochemistry; D011789:Quantum Theory; D013057:Spectrum Analysis / Q000379:methods*; D014732:Vibration
chemical_list: D002074:Butanones; C005222:methylethyl ketone