Study of the ground state of PO+ using photoelectron spectroscopy

Abstract

The band associated with the first ionization potential of the PO(X²Π) radical, corresponding to the process PO⁺(X¹Σ⁺)â†� PO(X²Π), has been observed for the first time by vacuum ultraviolet photoelectron spectroscopy. The adiabatic first ionization potential was measured as 8.39 ± 0.01 eV and the following spectroscopic parameters were determined for the PO⁺(X¹Σ⁺) state: text-decoration:overline w _e= 1410 ± 30 cm^–1, r_e= 1.419 ± 0.005 Å, and D_e= 8.25 ± 0.01 eV.