title: First spectroscopic observation of gold(i) butadiynylide: Photodetachment velocity map imaging of the AuC4H anion.
abstract: The velocity map imaging technique was used in the investigation of gold(i) butadiynylide, AuC4H(-), with images recorded at two excitation wavelengths. The resultant photodetachment spectra show a well defined vibrational progression in the neutral with an energy spacing of 343 ± 3 cm(-1). The adiabatic electron affinity was determined to be 1.775 ± 0.005 eV and assigned to the X(1)Σ(+)←X(2)Σ(+) transition between the anionic and neutral ground states. Franck-Condon simulations performed on density functional theory optimized geometries assisted the assignment of linear geometries to the neutral and anion and the observed vibrational progression to that of the Au-C4H stretch.
authors.affiliation: Department of Chemistry, University of Adelaide, Adelaide, South Australia 5005, Australia.
authors.forename: Bradley R
authors.initials: BR
authors.lastname: Visser
authors.affiliation: Engineering and Science, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany.
authors.forename: Matthew A
authors.initials: MA
authors.lastname: Addicoat
authors.affiliation: School of Chemical and Physical Sciences, Flinders University, Adelaide, South Australia 5001, Australia.
authors.forename: Jason R
authors.initials: JR
authors.lastname: Gascooke
authors.affiliation: School of Chemical and Physical Sciences, Flinders University, Adelaide, South Australia 5001, Australia.
authors.forename: Warren D
authors.initials: WD
authors.lastname: Lawrance
authors.affiliation: Department of Chemistry, University of Adelaide, Adelaide, South Australia 5005, Australia.
authors.forename: Gregory F
authors.initials: GF
authors.lastname: Metha