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Sub-Doppler double-resonance spectroscopy of NH3 using a tunable-diode laser and a CO laser

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Abstract

Results are given for a Stark-tuned double-resonance experiment, using a CO-laser pump and a diode-laser probe. The CO laser, operating on the 13–12 P(15) line at 1775.2588 cm−1, is locked by Lamb-dip stabilization to one of the Stark components of the aRR(9,9) ν4 line of NH3. The diode laser probes the aQ(9, 9) ν2 line at 921.255 cm−1, revealing a complex spectrum of sub-Doppler features, the narrowest of which are 5.3 ± 0.3 MHz wide. As well as the resonances associated with population depletion of the common lower levels, we see line-narrowing effects that are due to two-quantum Raman-type processes and collision-induced resonances arising from state-changing collisions that preserve the molecular velocities. The zero-field aRR(9, 9) ν4 line is established to be 264.1 ± 5.0 MHz above the CO-laser line.

© 1981 Optical Society of America

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