Photothermal Deflection Spectroscopy of Collected Aerosols
Photothermal Deflection Spectroscopy of Collected Aerosols Photothermal Deflection Spectroscopy of Collected Aerosols
Photothermal Detection:ApparatusesContinuous Excitation Homogeneous Sample– e.g. continuous-wave laserexcited photothermal lens Heterogeneous Sampleor Experiment Geometry– e.g. photothermal deflectionfrom arc-lamp excited surfacePulsed Excitation Homogeneous Sample– e.g. pulsed-laser laser excitedBrillion scattering (PT gratings) Heterogeneous Sampleor Experiment Geometry– e.g. pulsed-laser laser excitedcylindrical sample cell andsurface excitation
Photothermal Detection: ComparisonContinuous Excitation: Homogeneous Sample– Very sensitive non-aqueous– Convection & flow noise– Requires laser source– Signal loss with flow Solid Sample orHeterogeneous Geometry– Can use regular light sources– Good fluid heat transfer– May reduce convectionPulsed Excitation: Homogeneous Sample– Most sensitive for gases– Nonlinear effects common– Requires laser source– Best for flowing samples Solid Sample orHeterogeneous Geometry– Highest temperature change– Sample damage– Nonlinear effects– Use laser sources
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<strong>Photothermal</strong> Detection:ApparatusesContinuous Excitation Homogeneous Sample– e.g. continuous-wave laserexcited photothermal lens Heterogeneous Sampleor Experiment Geometry– e.g. photothermal deflectionfrom arc-lamp excited surfacePulsed Excitation Homogeneous Sample– e.g. pulsed-laser laser excitedBrillion scattering (PT gratings) Heterogeneous Sampleor Experiment Geometry– e.g. pulsed-laser laser excitedcylindrical sample cell andsurface excitation
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