Photoionization mass spectrometric study of NO. A closer look at the threshold region

Abstract

The photoionization efficiency curve of NO⁺ was obtained using the argon continuum in the energy range 9.25–10.00 eV. Considerable fine structure is observed superimposed upon the vibrational steps of the NO⁺ ionization curve, which is attributed to vibrational autoionization. This structure has been assigned to Rydberg series converging to the excited vibrational levels of the ground NO⁺ ion (¹Σ⁺).