Photothermal Deflection Spectroscopy of Collected Aerosols
Photothermal Deflection Spectroscopy of Collected Aerosols Photothermal Deflection Spectroscopy of Collected Aerosols
Summary of Aerosol Data Analysis No detected loss of signal with time No detected damage to sample at the relative low fluence Actively probed area ~ 10 -5 m 2 Number of aerosol “spots”– ~1000 for ammonium nitrate– ~ 100 for Malathion SNR indicates single aerosol detection possible withunimproved apparatus Substrate results in negligible signal
Aerosols Number Concentration1009080‣ Signal increases withnumber of particles andcoverage areaNumber of Particles70605040302010R 2 = 0.981500 20 40 60 80 100 120 140Loading Time [s]0.5‣ Linear calibrationwithin the loading timerange.Photothermal Signal0.450.40.350.30.250.20.150.10.05R 2 = 0.987500 20 40 60 80 100Predicted Counts
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Summary <strong>of</strong> Aerosol Data Analysis No detected loss <strong>of</strong> signal with time No detected damage to sample at the relative low fluence Actively probed area ~ 10 -5 m 2 Number <strong>of</strong> aerosol “spots”– ~1000 for ammonium nitrate– ~ 100 for Malathion SNR indicates single aerosol detection possible withunimproved apparatus Substrate results in negligible signal
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