title: Vibrationally resolved photoelectron imaging of gold hydride cluster anions: AuH(-) and Au(2)H(-).
abstract: Photoelectron spectra and angular distributions in photodetachment of gold hydride anions AuH(-) and Au(2)H(-) have been obtained using photoelectron velocity-map imaging. Both the images exhibit vibrationally resolved ground state transitions. The adiabatic electron affinities of AuH and Au(2)H are measured to be 0.758(20) and 3.437(3) eV, respectively. Franck-Condon analyses of the AuH spectra determined that the equilibrium bond length of the ground state of AuH(-) is 1.597(6) A. The photoelectron images of Au(2)H(-) show a vibrational progression of 148(4) cm(-1) assigned to the Au-Au stretching mode at the ground state. Ab initio calculation results are in excellent agreement with the experimental results. For the ground state of Au(2)H, a new bent Au-Au-H structure with the angle of 131 degrees is suggested. Moreover, energy-dependent photoelectron anisotropy parameters are also reported and discussed.
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, People's Republic of China.
authors.forename: Xia
authors.initials: X
authors.lastname: Wu
authors.forename: Zhengbo
authors.initials: Z
authors.lastname: Qin
authors.forename: Hua
authors.initials: H
authors.lastname: Xie
authors.forename: Ran
authors.initials: R
authors.lastname: Cong
authors.forename: Xiaohu
authors.initials: X
authors.lastname: Wu
authors.forename: Zichao
authors.initials: Z
authors.lastname: Tang
authors.forename: Hongjun
authors.initials: H
authors.lastname: Fan