Photothermal Deflection Spectroscopy of Collected Aerosols

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PrinciplesOptical energy absorbed and not lost through emission results in sampleheating. For pulsed excitationαHYHδ T =ρCThe temperature change alters the sample’s s refractive index.⎛ dn⎞δn= ⎜ ⎟ δT⎝dT⎠ PThe complex transmission produces a phase shift that is converted d to apower change by a variety of optical techniques.Photothermal detection techniques are all ultimately diffraction-based.P
Apparatuses to DetectPhotothermal HeatingPhotothermal Reflection Lens(Photothermal Bump Detection)THERMAL LENSDETECTORHEATINGBEAMLENSVISIBLE PROBELASERPhotothermal Deflection(Mirage Effect)SAMPLEVISIBLE PROBELASERPOSITIONSENSINGDETECTORLENS
Page 3: Chemical Analysis Perspective ofPho
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 and 24: IR Laser-Excited Photothermal Defle
Page 25 and 26: Aerosols Number Concentration100908
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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