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Assessing the Accuracy of Complex Refractive Index Retrievals from Single Aerosol Particle Cavity Ring-Down Spectroscopy

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)1077-1095
Number of pages19
JournalAerosol Science and Technology
Volume50
Issue number10
Early online date3 Aug 2016
DOIs
DateAccepted/In press - 16 Jul 2016
DateE-pub ahead of print - 3 Aug 2016
DatePublished (current) - 2 Oct 2016

Abstract

Cavity ring-down spectroscopy (CRDS) of single, optically manipulated aerosol particles affords quantitative retrieval of refractive indices for particles of fixed or evolving composition with high precision. Here, we quantify the accuracy with which refractive index determinations can be made by CRDS for single particles confined within the core of a Bessel laser beam and how that accuracy is degraded as the particle size is progressively reduced from the coarse mode (> 1 μm radius) to the accumulation mode (< 500 nm radius) regime. We apply generalised Lorenz-Mie theory to the intra-cavity standing wave to explore the effect of particle absorption on the distribution of extinction cross section determinations resulting from stochastic particle motion in the Bessel beam trap. The analysis provides an assessment of the accuracy with which the real, n, and imaginary, κ, components of the refractive index can be determined for a single aerosol particle.

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via Taylor & Francis at http://www.tandfonline.com/doi/full/10.1080/02786826.2016.1219691. Please refer to any applicable terms of use of the publisher.

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via Taylor & Francis at http://www.tandfonline.com/doi/full/10.1080/02786826.2016.1219691. Please refer to any applicable terms of use of the publisher.

    Final published version, 737 KB, PDF document

    Licence: CC BY

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