Abstract
Σ+,H′ 2Π±(v′=2), and 4dσ,πO2Σ+,O′ 2Π±(v′=0) Rydberg states of NO molecules are described. The analyses of the two-photon excitation functions and infrared emission spectra revealed that only the 2Π- component was involved in PFWM. This is in good accordance with the absence of amplified spontaneous emission (ASE) in the 2Σ+ and 2Π+ components due to their predissociative character. Results provide some support for the mechanism that the generation of the vacuum ultraviolet radiation was brought by PFWM in which ASE served as a third driving wave.
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