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Issue 32, 2007
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Infrared spectroscopy of acetic acid and formic acid aerosols: pure and compound acid/ice particles

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Abstract

Acetic acid aerosol particles, formic acid aerosol particles and mixed acid/ice particles were generated in a collisional cooling cell at a temperature of 78 K and investigated using in situ rapid scan Fourier transform infrared spectroscopy. The infrared spectra reveal that the internal structure of the particles critically depends on the particle formation conditions and, especially for the mixed particles, on the composition. The acetic acid particles are likely to have only a partially crystalline structure whereas the formic acid particles are likely to have an overall crystalline structure. The existence of acid in the mixed acid/ice particles prevents the ice from crystallization even at low acid concentrations (less than 10%). Mid-infrared refractive index data were derived from the different particle spectra, which can be helpful for remote sensing of such systems.

Graphical abstract: Infrared spectroscopy of acetic acid and formic acid aerosols: pure and compound acid/ice particles

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Publication details

The article was received on 27 Mar 2007, accepted on 05 May 2007 and first published on 29 Jun 2007


Article type: Paper
DOI: 10.1039/B704600F
Citation: Phys. Chem. Chem. Phys., 2007,9, 4535-4544

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    Infrared spectroscopy of acetic acid and formic acid aerosols: pure and compound acid/ice particles

    M. Gadermann, D. Vollmar and R. Signorell, Phys. Chem. Chem. Phys., 2007, 9, 4535
    DOI: 10.1039/B704600F

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