Infrared–infrared double resonance on a molecular beam of NH3

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Abstract
A novel laser spectroscopic method with a molecular beam is successfully demonstrated. This technique is widely applicable for studies of collisional relaxation on a variety of molecular transitions, even when untunable infrared molecular lasers are used. The effect of collision‐induced transitions between the vibration–rotation levels of NH3 are investigated by infrared–infrared double resonance. It is found that the rate of excitation energy transfer is closely related to the molecular energy level structure.