Abstract

The molecular Stark effect in NH2D was used to modulate the 10. 6-μ P(20) line of a CO2 laser yielding a modulation depth of 40% from a 200-V cm−1 rms signal applied to a 19. 7-cm gas cell external to the laser. NH2D was prepared by mixing ND3 and NH3. The absorption coefficient of the M=4 Stark-split line was measured as a function of mixing ratio and pressure. The observed pressure-broadening coefficient was 32. 5 MHz/Torr.

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