2021
DOI: 10.48550/arxiv.2102.06803
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Accurate Determination of an alkali-inert gas diffusion coefficient using coherent transient emission from a density grating

A. Pouliot,
G. Carlse,
T. Vacheresse
et al.

Abstract: We demonstrate a new technique for the accurate measurement of diffusion coefficients for alkali vapor in an inert buffer gas. The measurement was performed by establishing a spatially periodic density grating in isotopically pure 87 Rb vapor and observing the decaying coherent emission from the grating due to the diffusive motion of the vapor through N2 buffer gas. We obtain a diffusion coefficient of 0.245 ± 0.002 cm 2 /s at 50 • C and 564 Torr. Scaling to atmospheric pressure, we obtain D0 = 0.1819 ± 0.0024… Show more

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