Fast passage in rotational spectroscopy: Theory and experiment

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Abstract
The theoretical and experimental analysis of fast passage phenomena in rotational spectroscopy is described in the pressure broadened limit. The phenomenon of Stark sweeping fast passage is carefully distinguished from the phenomena of transient absorption and transient emission that were treated earlier. We show that the observed response at the detector after Stark sweeping a molecular resonance through a fixed oscillator is a combination of off‐resonance absorption and the beat between the fixed oscillator and the emission from the fast passage induced polarization.