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Bulletin of the American Physical Society

Enhanced metastable population through evaporation cooling and recombination in the argon afterglow

Uwe Czarnetzki, Yusuf Çelik, Tsanko V. Tsankov, Mitsutoshi Aramaki, S. Yoshimura, D Luggenhölscher

Published Nov 16, 2011• 0 citations
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Photon echoes generated from visible transitions in the noble gases helium, neon, and argon are observed and the collisional relaxation rates are measured. The photon echoes are excited on transitions initiating from metastable states which are populated by electron impact in an rf discharge. The photon-echo intensity is measured as a function of time after the discharge is turned off and as a function of gas pressure. The reduction of the echo intensity in these two experiments is attributed to relaxation of the metastable population in the afterglow and dephasing collisions, respectively. The dependence of the photon-echo damping time on transition wavelength and perturber gas is interpreted by means of a simple van der Waals model for the excited-atom and perturber-gas interaction.