Radiation pressure measurements on micron-size individual dust grains

Details Radiation pressure measurements on micron-size individual dust grains Radiation pressure measurements on micron-size individual dust grains

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.1229a&link_type=abstract

Journal of Geophysical Research Space Physics, Volume 108, Issue A6, pp. SSH 2-1, CiteID 1229, DOI 10.1029/2002JA009744

Physics

7

Interplanetary Physics: Interplanetary Dust, Interplanetary Physics: Instruments And Techniques, Planetology: Comets And Small Bodies: Dust, Planetology: Fluid Planets: Rings And Dust, Planetology: Solar System Objects: Dust

Scientific paper

Measurements of electromagnetic radiation pressure have been made on individual silica (SiO2) particles levitated in an electrodynamic balance. These measurements were made by inserting single charged particles of known diameter in the 0.2- to 6.82-μm range and irradiating them from above with laser radiation focused to beam widths of ~175-400 μm at ambient pressures ~10-3-10-4 torr. The downward displacement of the particle due to the radiation force is balanced by the electrostatic force indicated by the compensating dc potential applied to the balance electrodes, providing a direct measure of the radiation force on the levitated particle. Theoretical calculations of the radiation pressure with a least-squares fit to the measured data yield the radiation pressure efficiencies of the particles, and comparisons with Mie scattering theory calculations provide the imaginary part of the refractive index of SiO2 and the corresponding extinction and scattering efficiencies.

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