Optical-optical double resonance study of the perturbed O2 d3sσg(1Πg) Rydberg state excited via single rotational levels of the b(1Σg+) valence state

Abstract

Optical-optical double resonance is conducted to excite the Rydberg state of oxygen. The line positions match well with the theoretical calculations. This vibronic coupling calculation is done involving the valence state. In contrast to theoretical predictions, no variations in the line widths were observed. The line intensities in resonance enhanced multiphoton ionization (REMPI) spectrum is controlled by mixing of the state with a nearby valence state having much lower ionization cross section at the probe wavelengths used.