Ultrasensitive Absorption Spectroscopy of Optically-Trapped Aerosol Droplets

Kerry J. Knox, Jonathan P. Reid*

*Corresponding author for this work

Research output: Contribution to journalLetter (Academic Journal)peer-review

31 Citations (Scopus)


High-sensitivity optical absorption measurements on individual sub-picoliter aqueous droplets are reported using aerosol optical tweezers to simultaneously manipulate and characterize a sample droplet and a control droplet for comparison. It is demonstrated that the detection sensitivity to trace analytes is set by the weak absorption by the solvent, water, and that absorbances less than 5 x 10(-7) can be measured over pathlengths of less than 10 mu m. The potential applications of this approach to analyze aerosol particle composition and to perform trace analysis are discussed.

Original languageEnglish
Pages (from-to)10439-10441
Number of pages3
JournalJournal of Physical Chemistry A
Issue number42
Publication statusPublished - 23 Oct 2008




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