TPEsCO spectra of HCl2+ and DCl2+: experiment and theory

Abstract Vibrationally resolved threshold photoelectrons in coincidence (TPEsCO) spectra of the X 3 Σ − and a 1 Δ states of HCl 2+ and DCl 2+ are compared with ab initio simulations. The four resonances observed in the TPEsCO spectra of both the X 3 Σ − and a 1 Δ states of HCl 2+ are assigned as three quasi-bound vibrational levels and one continuum resonance with an energy greater than the potential barrier maximum. The four clearly identified resonances observed in the TPEsCO spectra of both the X 3 Σ − and a 1 Δ states of DCl 2+ are assigned as quasi-bound vibrational levels.