Knight, JW, Egan, JV orcid.org/0000-0001-9676-3990, Orr-Ewing, AJ et al. (1 more author) (2022) Direct Spectroscopic Quantification of the Absorption and Scattering Properties for Single Aerosol Particles. The Journal of Physical Chemistry A, 126 (9). pp. 1571-1577. ISSN 1089-5639
Abstract
Understanding the optical properties of micrometer-scale light-absorbing aerosol particles is of paramount importance in addressing key challenges in atmospheric and physical chemistry. For example, the absorption of solar radiation by atmospheric aerosols represents one of the largest uncertainties in climate models. Moreover, reaction acceleration within the unique environments of aerosol droplets cannot be replicated in bulk solutions. The causes of these reaction rate enhancements remain controversial, but ultrasensitive spectroscopic measurements of evolving aerosol optical properties should provide new insights. We demonstrate a new approach using cavity ring-down spectroscopy that allows the first direct spectroscopic quantification of the continuously evolving absorption and scattering cross sections for single, levitated, micrometer-scale particles as their size and chromophore concentration change. For two-component droplets composed of nigrosin and 1,2,6-hexanetriol, the unprecedented sensitivity of our measurements reveals the evolving real and imaginary components of the refractive index caused by changes in concentration as 1,2,6-hexanetriol slowly evaporates.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 American Chemical Society. This is an author produced version of an article published in The Journal of Physical Chemistry A. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Cavities,Liquids,Absorption,Optical properties,Aerosols |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 26 Apr 2022 15:35 |
Last Modified: | 23 Feb 2023 01:13 |
Status: | Published |
Publisher: | American Chemical Society (ACS) |
Identification Number: | 10.1021/acs.jpca.2c00532 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:186020 |