Rotational-resolved pulsed field ionization photoelectron study of NO+(a 3Σ+,v+=0–16) in the energy range of 15.6–18.2 eV

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Abstract
We have obtained rotationally resolved pulsed field ionization photoelectron (PFI-PE) spectra of NO in the energy range of 15.6–18.2 eV, covering ionization transitions of NO + (a 3 Σ + ,v + =0–16,J + )← NO (X 2 Π 3/2,1/2 ,v ″ =0,J ″ ). The PFI-PE bands for NO + (a 3 Σ + ,v + =1–5,7–10,12–14,16) obtained in this experiment represent the first rotationally resolved spectroscopic data for these states. The simulation of these PFI-PE bands provides accurate molecular constants for NO + (a 3 Σ + ,v + =0–5,7–10,12–14,16), including ionization energies, vibrational constants ( ω e + =1295.2±0.1 cm −1 , ω e + χ e + =15.198±0.002 cm −1 ), and rotational constants ( B e + =1.3501±0.0070 cm −1 , α e + =0.0206±0.0001 cm −1 ). As observed in the PFI-PE study of NO + (X 1 Σ + ), this experiment reveals a generally increasing trend for the maximum ΔJ value and intensities of higher ΔJ branches as v + (or bond distance) for NO + (a 3 Σ + ) is increased. This observation can be taken as strong support of the electron-molecular-ion-core scattering model for angular momentum and energy exchanges in the threshold photoionization of NO.

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