Projects per year
Abstract
A Bessel beam optical trap is combined with continuous wave cavity ringdown spectroscopy to measure the extinction cross section of individual aerosol particles. Particles, similar to 1 mu m in size, can be captured indefinitely and processes that transform size or refractive index studied. The measured light extinction induced by the particle is shown to depend on the position of the particle in the cavity, allowing accurate measurements of the mode structure of a high finesse optical cavity without significant perturbation. The variation in extinction efficiency of a sodium chloride droplet with relative humidity is shown to agree well with predictions from Mie scattering theory.
Original language | English |
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Pages (from-to) | 1748-1752 |
Number of pages | 5 |
Journal | Journal of Physical Chemistry Letters |
Volume | 4 |
Issue number | 10 |
DOIs | |
Publication status | Published - 16 May 2013 |
Keywords
- CAVITY RING-DOWN
- OPTICAL-PROPERTIES
- REFRACTIVE-INDEX
- SALT AEROSOLS
- SCATTERING
- SPECTROSCOPY
- SPECTROMETER
Projects
- 2 Finished
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A Novel Instrument for Characterising the Properties and Processes of Single Accumulation Mode Aerosol Particles
Reid, J. P. & Orr-Ewing, A. J.
1/03/10 → 1/03/12
Project: Research
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NEW STRATEGIES FOR SAMPLING, ANALYSING AND UNDERSTANDING AEROSOLS
Reid, J. P.
1/03/09 → 1/09/14
Project: Research