We report the first measurements of small angle neutron scattering from an aerosol. The aerosol was produced by expanding a D2O-N2 vapor mixture in a supersonic Laval nozzle. The neutron wavelength (0.5 nm) is less than the typical particle size, and we can therefore derive the average particle size (5-8 nm), number density (~1012 cm-3), and polydispersity of the size distribution directly from the experimental data rather than by inferring them from complex models of particle formation and growth. We also predict and observe a Doppler shift-induced anisotropy in the scattering pattern due to the directed motion of the aerosol in the nozzle. Further applications of this new technique are discussed.
B. E. Wyslouzil et al., "Small Angle Neutron Scattering from Nanodroplet Aerosols," Physical Review Letters, vol. 79, no. 3, pp. 431-434, American Physical Society (APS), Jul 1997.
The definitive version is available at https://doi.org/10.1103/PhysRevLett.79.431
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