Photothermal Deflection Spectroscopy of Collected Aerosols
Photothermal Deflection Spectroscopy of Collected Aerosols
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 <strong>of</strong> optical techniques.<strong>Photothermal</strong> detection techniques are all ultimately diffraction-based.P
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