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Abstract
We have performed small-angle Rayleigh light-scattering measurements in polymer solutions under various externally applied temperature gradients. Our experiments confirm the existence of an enhancement of the concentration fluctuations. The nonequilibrium concentration fluctuations are proportional to $(\ensuremath{\nabla}T{)}^{2}{/k}^{4}$, where $\ensuremath{\nabla}T$ is the applied temperature gradient, and $k$ is the wave number of the fluctuations. The measured strengths of the nonequilibrium fluctuations in the dilute and semidilute concentration regime agree with the strengths calculated from fluctuating hydrodynamics.
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