Vibrationally Resolved Photoelectron Imaging of Au3H

We report a combined photoelectron velocity map imaging spectroscopy and density functional theory investigation on the au3h- anion. transition between the anionic electronic ground state and the neutral electronic ground state is revealed. vibrationally resolved spectra were recorded at two different photon energies, providing a wealth of spectroscopic information for the electronic ground state of the au3h. franck-condon simulations of the ground-state transition are carried out to assist in the assignment of the vibrationally resolved spectra. the electron affinity and vertical detachment energy of au3h are measured to be 2.548 +/- 0.001 and 2.570 +/- 0.001 ev, respectively. three stretching vibrational modes are determined to be activated upon photodetachment, with the frequencies of 2100 +/- 100, 177 +/- 10, and 96 +/- 10 cm(-1).