Related Experiment Video
Updated: Jun 20, 2026

Infrared Degenerate Four-wave Mixing with Upconversion Detection for Quantitative Gas Sensing
Published on: March 22, 2019
Observation of the Stark effect in high-overtone band transitions of NH(3)
Abstract:
A sensitive dye-laser spectrometer is constructed to observe the Stark effect of weak-overtone transitions in NH(3). A DeltaP/P sensitivity of 10(-6) is achieved with the help of a laser-noise-reduction system. A relatively short (30-cm) and narrow-gap (0.25-mm) Stark electrode makes it possible to apply a high electric field on molecular gas at low pressure (~1 Torr). The Stark components of the upsilon = 5 overtone band transitions of NH(3) are well resolved. The rotational assignments are confirmed, and the dipole moment in the upsilon = 5 excited vibrational state is determined to be 1.40 +/- 0.02 D.
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