Demonstration of variable angle super-heterodyne dynamic light scattering for measuring colloidal dynamics

We demonstrate a prototype light scattering instrument combining a frequency domain approach to the intermediate scattering function from Super-Heterodyning Doppler Velocimetry with the versatility of a standard homodyne dynamic light scattering goniometer setup for investigations over a large range of scattering vectors. Comparing to reference experiments in correlation-time space, we show that the novel approach can determine diffusion constants and hence hydrodynamic radii with high precision and accuracy. Possible future applications are discussed shortly.

Automated summary

The study demonstrates a prototype light scattering instrument that combines frequency domain approach with the versatility of a standard homodyne setup for investigations over a large range of scattering vectors. By comparing with reference experiments in correlation-time space, the novel approach is shown to determine diffusion constants and hydrodynamic radii with high precision and accuracy. Possible future applications are briefly discussed.