A method is developed for obtaining the molecular composition of a single suspended microparticle by Fourier transform infrared spectroscopy. The particle is held in an electrodynamic balance and irradiated simultaneously by the infrared output from a Michelson interferometer and the visible light from a dye laser. The laser is tuned to an edge of an optical resonance of the particle while the IR beam is chopped. Through evaporation and condensation the chopped IR beam causes a size modulation of the droplet, which in turn induces a fluctuation in the laser light scattered from the particle. The scattered light is detected at 90° with a photomultiplier, and the amplitude of the light fluctuation is measured with a lock‐in amplifier. The lock‐in signal is then inverted by a discrete fast Fourier transform routine (FFT), to yield the particle absorption spectrum. Spectra of (NH4)2SO4 droplets at different solute concentrations are presented. The data shown include the first infrared spectrum of a highly supersaturated solution.
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1 June 1987
Research Article|
June 01 1987
Fourier transform infrared spectroscopy of a single aerosol particle
Gideon Sageev Grader;
Gideon Sageev Grader
Department of Chemical Engineering, California Institute of Technology, Pasadena, California 91125
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Stephen Arnold;
Stephen Arnold
Department of Physics, Polytechnic Institute of New York, Brooklyn, New York 11201
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Richard C. Flagan;
Richard C. Flagan
Department of Chemical Engineering, California Institute of Technology, Pasadena, California 91125
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John H. Seinfeld
John H. Seinfeld
Department of Chemical Engineering, California Institute of Technology, Pasadena, California 91125
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J. Chem. Phys. 86, 5897–5903 (1987)
Article history
Received:
November 28 1986
Accepted:
February 17 1987
Citation
Gideon Sageev Grader, Stephen Arnold, Richard C. Flagan, John H. Seinfeld; Fourier transform infrared spectroscopy of a single aerosol particle. J. Chem. Phys. 1 June 1987; 86 (11): 5897–5903. https://doi.org/10.1063/1.452473
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