Abstract
Forty-four NH3 absorption spectral lines of the combination tones of the vibration–rotation transitions were observed at 1.4988–1.5520 μm with a 1.5-μm grating-external-cavity semiconductor laser. The linewidth and absorption rate of NH3 absorption spectral lines were measured. Also, the changes of center frequency and linewidth of the NH3 absorption spectral line with the variation of NH3 pressure were measured for what is to our knowledge the first time.
© 1993 Optical Society of America
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