Resonant Secondary Emission in NaNO₂

Abstract

Resonant secondary emission in NaNO₂ has been investigated in the energy region near the zero-phonon line of the singlet absorption at ν₀₀ using a tunable dye laser. Multiple-order Raman scattering due to ν₂ vibration of NO₂⁻ shows resonant enhancement under the excitation near ν₀₀. The secondary emission spectrum is composed of sharp (Raman-like) and relatively broad (luminescence like) components when excited near and above ν₀₀. Behaviors of the secondary emission spectrum with the change of the incident photon energy and its polarization characteristics are discussed. Variations of the spectrum with the change of the intensity of the incident light and the sample temperature are also discussed.