Far infrared stimulated emission from the 8s and 8f Rydberg states of NO

Stimulated emission of NO in the far infrared region has been analyzed. The longest wavelength detected in the current study is ∼27 μm (∼11 THz), which is corresponding to the 8sσ → 7pσ inter-Rydberg transition. The possibility of the black body induced transitions is briefly discussed.