title: Adiabatic ionization potential of acetic acid and torsional dynamics of its cation.
abstract: Pulsed-field-ionization zero-kinetic-energy photoelectron spectroscopy and supersonic cooling are used to investigate the CH(3) torsional dynamics of the acetic acid cation and to determine an accurate value for the first adiabatic ionization potential of acetic acid (IP=85 912+/-5 cm(-1)), which has been the subject of debates for more than 40 yr. A doubling of the torsional barrier upon ionization is due to a significant shortening of the C-C bond and reduces the tunneling efficiency by an order of magnitude.
authors.affiliation: Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver V6T 1Z1, Canada.
authors.forename: Philipp
authors.initials: P
authors.lastname: Zielke
authors.forename: Piotr W
authors.initials: PW
authors.lastname: Forysinski
authors.forename: David
authors.initials: D
authors.lastname: Luckhaus
authors.forename: Ruth
authors.initials: R
authors.lastname: Signorell
mesh_terms: D019342:Acetic Acid / Q000737:chemistry*; D002412:Cations / Q000737:chemistry; D004583:Electrons; D007834:Lasers; D017785:Photons; D012399:Rotation; D013057:Spectrum Analysis; D013696:Temperature; D013816:Thermodynamics; D054159:Torsion, Mechanical
chemical_list: D002412:Cations; D019342:Acetic Acid