1203.2421 (R. Tsekov)
R. Tsekov
The Brownian motion of a light quantum particle in a heavy classical gas is theoretically described and a new expression for the friction coefficient is obtained for arbitrary temperature. At zero temperature it is equal to the de Broglie momentum of the mean free path divided by the mean free path. Alternatively, the corresponding mobility of the quantum particle in the classical gas equals to the square of the mean free path divided by the Planck constant.
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http://arxiv.org/abs/1203.2421
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