title: Guiding electron emissions by excess negative charges in multiply charged molecular anions.
abstract: Using photoelectron imaging, we show the effects of excess negative charges on the directions of outgoing electrons in multiply charged anions. Photoemissions are observed to occur either in a perpendicular or parallel direction, depending on the molecular configurations and origins of the detached electrons. Detachment of the π electrons from biphenyl-disulfonate dianions is shown to occur in a perpendicular direction due to the Coulomb repulsion from the two terminal charges, whereas detachment from the sulfonate groups in linear aliphatic disulfonates occurs in parallel directions.
authors.affiliation: Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA.
authors.forename: Chuan-Gang
authors.initials: CG
authors.lastname: Ning
authors.forename: Phuong Diem
authors.initials: PD
authors.lastname: Dau
authors.forename: Lai-Sheng
authors.initials: LS
authors.lastname: Wang