Photon Echoes in Krypton and Xenon Discharges
Studies of pressure broadening of spectral lines have proven to be valuable probes of atomic dynamics and interactions.1 Photon echo experiments improve upon the more traditional frequency broadening experiments by measuring the time evolution of processes whose contribution to the overall linewidth is small compared to the Doppler width.2 To our knowledge we present for the first time the results of photon echo measurements in weakly ionized plasmas of Krypton and Xenon.3 At the pressures used in these measurements (less than 2 Torr) the pressure broadened width is only a few percent of the Doppler width.
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