Abstract
Intense infrared stimulated lines at wavelengths around 2.5 μm have been observed upon excitation of Na 2 by uv radiation from a frequency-doubled narrow-band dye laser. Frequencies of these IR lines have been measured when the pump laser was tuned to C 1Π u ← X 1Σ g + assigned transitions in the wavelength range 331–334 nm. High-resolution spectroscopy measurements of the involved rovibrational levels of both C 1Π u and 3 1Σ g + electronic states allow the unambiguous assignment of these IR laser lines to C 1Π u → 3 1Σ g + transitions.
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