Vibrationally- and rotationally-resolved photoelectron imaging of cryogenically-cooled SbO₂^-

We report a temperature-controlled photoelectron imaging study of SbO2-, produced from a laser vaporisation source and cooled in a cryogenic 3D Paul trap. Vibrationally resolved photoelectron spectra are obtained for the ground state detachment transition, yielding the bending frequencies for both SbO2 and SbO2-. Franck-Condon simulations also allow the estimate of the vibrational temperature of the trapped SbO2- anion. A near-threshold spectrum of SbO2- at a photon energy of 3.4958 eV reveals partially resolved rotational structure for the 0-0 transition, which yields an accurate electron affinity of 3.4945 +/- 0.0004 eV for SbO2. The rotational simulation also yields an estimated rotational temperature of the trapped ions.