Radoslaw Chrapkiewicz, Wojciech Wasilewski, Czeslaw Radzewicz
Diffusion is the main limitation of storage time in multispatial mode applications of warm atomic vapors. Surprisingly, there is scarce data for diffusion coefficients of Rubidium in buffer gases and available measurement methods are poorly suited to modern experiments. Here we present a simple, efficient and direct method of measuring diffusion coefficients in gases by creating, storing and retrieving spatially-varying atomic coherence. Raman scattering provides a necessary interface to the atoms that allows for probing many spatial periodicities concurrently. We single out the diffusional component of depolarization and determine the diffusion coefficient.We found the normalized diffusion coefficients for Rubidium atoms in noble gases to be as follows: Neon 0.20 cm$^{2}$/s, Krypton 0.068 cm$^{2}$/s, Xenon 0.057 cm$^{2}$/s. We are the first to give experimental results for Xenon and we recommend this gas for multimode quantum storage applications.
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http://arxiv.org/abs/1304.5396
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