Abstract

The Stark spectra of Rydberg states of NO below the υ+ = 0 ionization limit, with principal quantum numbers n = 25–30, have been investigated in the presence of dc electric fields in the range 0–150 V cm−1. The Stark states were accessed by two-colour, double-resonance excitation via the υ′ = 0, N′ = 0 rovibrational state of the A2Σ+ state. The N(2D) atoms produced by predissociation were measured by (2 + 1) resonance-enhanced multiphoton ionization, and compared with pulsed-field ionization spectra of the bound Rydberg state population (Patel et al 2007 J. Phys. B: At. Mol. Opt. Phys. 40 1369).

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