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Unexpected two-quantum resonances are observed in potassium vapor using two-dimensional Fourier-transform spectroscopy. These transitions are an unambiguous indication of many-body interactions, which arise from the long-range interatomic coupling that is responsible for resonance self-broadening.
The transient four-wave mixing signal from a dense potassium vapor, which displays non-Markovian dynamics, depends on the excitation strength. Theoretical fits reveal the excitation dependence of the parameters employ ed in a two-time correlation function.
The three-pulse photon echo technique has provided significant insight into ultrafast dynamics in a variety of condensed phase systems1. Clear signatures of non-Markovian dynamics in a dense potassium vapor2 provide the opportunity to gain further insight into the correlation function of frequency fluctuations both experimentally and theoretically. Here, experimental three-pulse photon echo peak shifts...
Three-pulse photon echo peak shift measurements in dense potassium vapor reveal an exponential peak shift, justifying an exponential two-time correlation function of frequency fluctuations, which is commonly assumed for more complex condensed phase systems.
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