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Molecular spectroscopy of a single aerosol particle

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Abstract

The absorption spectrum of a single micrometer-sized aerosol particle is measured for the first reported time in the IR. Particle absorption is determined through the IR modulation of visible scattered light near a structure resonance. This technique, termed structure resonance modulation spectroscopy, is used to measure the IR absorption spectrum of an (NH4)2SO4 aerosol droplet of 5.4-μm diameter in the region from 970 to 1280 cm−1. The resulting spectrum, when fitted by Mie theory, enables one to determine the molecular composition of the droplet.

© 1984 Optical Society of America

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