Fundamental investigation of photoacoustic signal generation from single aerosol particles at varying relative humidity.
Aerosols
Counter-propagating tweezers
Modulated Mie scattering
Optical trapping
Photoacoustic spectroscopy
Relative humidity
Journal
Photoacoustics
ISSN: 2213-5979
Titre abrégé: Photoacoustics
Pays: Germany
ID NLM: 101622604
Informations de publication
Date de publication:
Jun 2020
Jun 2020
Historique:
received:
18
12
2019
revised:
03
02
2020
accepted:
18
02
2020
entrez:
27
3
2020
pubmed:
27
3
2020
medline:
27
3
2020
Statut:
epublish
Résumé
Photoacoustic (PA) spectroscopy enjoys widespread applications across atmospheric sciences. However, experimental biases and limitations originating from environmental conditions and particle size distributions are not fully understood. Here, we combine single-particle photoacoustics with modulated Mie scattering to unravel the fundamental physical processes occurring during PA measurements on aerosols. We perform measurements on optically trapped droplets of varying sizes at different relative humidity. Our recently developed technique - photothermal single-particle spectroscopy (PSPS) - enables fundamental investigations of the interplay between the heat flux and mass flux from single aerosol particles. We find that the PA phase is more sensitive to water uptake by aerosol particles than the PA amplitude. We present results from a model of the PA phase, which sheds further light onto the dependence of the PA phase on the mass flux phenomena. The presented work provides fundamental insights into photoacoustic signal generation of aerosol particles.
Identifiants
pubmed: 32211293
doi: 10.1016/j.pacs.2020.100170
pii: S2213-5979(20)30010-0
pii: 100170
pmc: PMC7082628
doi:
Types de publication
Journal Article
Langues
eng
Pagination
100170Informations de copyright
© 2020 The Authors.
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