Photothermal aerosol absorption spectroscopy

Journal Article · Fri Feb 01 04:00:00 EST 1985 · Appl. Opt.; (United States)

DOI:https://doi.org/10.1364/AO.24.000422· OSTI ID:5954406

Lin, H; Campillo, A J

In situ aerosol absorption spectroscopy was performed using three photothermal detection schemes: phase fluctuation optical heterodyne spectroscopy, photothermal modulation of Mie scattering, and photophoresis. Particle specific absorption data of ammonium sulfate aerosols were obtained. The specific absorption coefficient for the sulfate ion was measured to be 0.5 m/sup 2//g at 1087 cm/sup -1/. Each of the three techniques allows single-particle and subnanogram per cubic centimeter detection sensitivity, and in all cases the relative absorption spectrum can be obtained directly from the data without the need for complex inverse scattering calculations.

• Research Organization: Brookhaven National Laboratory, Environmental Chemistry Division, Department of Applied Science, Upton, New York 11973
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5954406
• Journal Information: Appl. Opt.; (United States), Journal Name: Appl. Opt.; (United States) Vol. 24:3; ISSN APOPA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104 -- Spectral Procedures-- (-1987)
440300 -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
500100* -- Environment
Atmospheric-- Basic Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSORPTION SPECTRA
ABSORPTION SPECTROSCOPY
AEROSOLS
AMMONIUM COMPOUNDS
AMMONIUM SULFATES
COLLOIDS
DISPERSIONS
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUID FLOW
GAS FLOW
HETERODYNE RECEIVERS
HUMIDITY
LIGHT SCATTERING
MEASURING METHODS
MICROWAVE EQUIPMENT
MODULATION
OPTICAL PROPERTIES
OXYGEN COMPOUNDS
PARTICLE SIZE
PHYSICAL PROPERTIES
RADIO EQUIPMENT
REFRACTIVITY
RESOLUTION
SCATTERING
SENSITIVITY
SIGNAL-TO-NOISE RATIO
SIZE
SOLS
SPATIAL RESOLUTION
SPECTRA
SPECTROSCOPY
SULFATES
SULFUR COMPOUNDS