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

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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+).