Photothermal Deflection Spectroscopy of Collected Aerosols

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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
Page 3 and 4: Chemical Analysis Perspective ofPho
Page 5 and 6: Apparatuses to DetectPhotothermal H
Page 7 and 8: Photothermal Detection: ComparisonC
Page 9 and 10: Further Considerations for Chemical
Page 11 and 12: Photothermal Detection of Condensed
Page 13 and 14: PM - Updated RulesUS EPA Fine Parti
Page 15 and 16: Laboratory-Based Condensed PhaseAer
Page 17 and 18: Aerosol / Particle Generation Nebul
Page 19 and 20: Aerosols Generation and SamplingAto
Page 21 and 22: Size and Number Calibration Aerosol
Page 23: IR Laser-Excited Photothermal Defle
Page 27 and 28: So why are the detection limits so
Page 29 and 30: MOUDI Calibration CurveStage 6 (0.5
Page 31 and 32: Finite Element Analysis Modeling Fi
Page 33 and 34: Particle “Crowding” Effect Does
Page 35 and 36: Results for Substrate Thermal Condu
Page 37 and 38: Inference from Heat Transport and S
Page 39 and 40: Future Aerosol Work We need to us a
Page 41: Acknowledgements Several persons wo

Photothermal Deflection Spectroscopy of Collected Aerosols

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