title: Imaging intramolecular coulomb repulsions in multiply charged anions.
abstract: The properties of multiply charged anions are dominated by intramolecular Coulomb repulsion (ICR). Using photoelectron imaging, we show the effect of ICR on photoelectron angular distributions for a series of dianions, -O2C(CH2)_{n}CO_{2};{-} (D_{n};{2-}). The observed photoemission band of D_{n};{2-} was due to a perpendicular transition from the charged end group. However, photoemission intensities were observed to peak along the laser polarization for smaller n due to the strong ICR that forces electrons to be emitted along the molecular axis. This emission pattern weakens with increasing n and at D112- the angular distribution reverses back to peak at the perpendicular direction due to the reduced ICR.
authors.affiliation: Department of Physics, Washington State University, 2710 University Drive, Richland, Washington 99354, USA.
authors.forename: Xiao-Peng
authors.initials: XP
authors.lastname: Xing
authors.forename: Xue-Bin
authors.initials: XB
authors.lastname: Wang
authors.forename: Lai-Sheng
authors.initials: LS
authors.lastname: Wang