title: Photoacoustic determination of optical properties of aerosol particles collected on filters: development of a method taking into account substrate reflectivity.
abstract: The absorptivity of soot and methylene blue particles collected on Teflon filters is derived from photoacoustic measurements by least squares fitting a simple expression based on Beer's law to the experimental data. Refinements of the expression take into account the diffuse reflection of light by the filter substrate, yielding a base 10 absorptivity at 600 nm for soot of 3.00 +/- 0.37 m(2)/g. This value is in close agreement with the result of transmission measurements performed on the same samples (3.08 +/- 0.05 m(2)/g).
authors.forename: R
authors.initials: R
authors.lastname: Röhl
authors.forename: W A
authors.initials: WA
authors.lastname: McClenny
authors.forename: R A
authors.initials: RA
authors.lastname: Palmer