The stimulated emission pumping (SEP) process has been detected by means of a newly developed zero-background scheme based upon the Doppler-free technique of degenerate four-wave mixing (DFWM) spectroscopy. Rotationally resolved SEP-DFWM spectra recorded for the (02000) vibrational level of CS2 X̃ 1∑+g exhibit signal-to-noise ratios approaching 1000:1.
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Zhang et al. (1992) studied this question.
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