Size dependence of the photophoretic force

S. Arnold, M. Lewittes

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Abstract

The photophoretic force on a micron-sized sphere of glycerol is measured for a continuously changing size parameter (through evaporation) for excitation at 10.63 and 9.58 μ. Although the force at 9.58 μ is always forward ("positive" photophoresis), the force at 10.63 μ reverses in sign ("negative" photophoresis) and shows a periodic structure in size parameter (2πR/λ) with a periodicity of 0.77±0.03. It is shown that the point of reversal may be used in obtaining the imaginary component of the refractive index. The possibility of solar levitation of atmospheric aerosols is discussed.

Original languageEnglish (US)
Pages (from-to)5314-5319
Number of pages6
JournalJournal of Applied Physics
Volume53
Issue number7
DOIs
StatePublished - Dec 1 1982

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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