Abstract
Using a linearly-polarized, single-mode dye laser beam, tuned near the Na resonance doublet (but not on resonance), the polarization of the sideward Rayleigh scattering from Na atoms is experimentally studied. This polarization changes from nearly +100% when the laser wavelength is sufficiently off and outside the doublet, to nearly -100% when the laser wavelength is at a certain value inside the doublet, in good agreement with the predictions of Placzek. Self-collision-induced resonance fluorescence is also observed, and is unpolarized. The presence of foreign gas (∽ 100 torr of H 2, D 2, N 2 or Ne) does not affect the Rayleigh polarization, but does affect the magnitude and polarization of the collision-induced fluorescence.
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