Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published June 1993 | public
Journal Article

Fourier transform infrared analysis of aerosol formed in the photooxidation of 1-octene


The chemical composition of aerosol generated in the photooxidation of 1-octene was examined using infrared microscopy interfaced with a low pressure impactor. The low pressure impactor segregated the aerosol into eight size fractions and deposited the aerosol onto ZnSe impaction substrates. The ZnSe surfaces were transparent in the mid-infrared region and therefore allowed direct analysis of the aerosol, with no extraction, using infrared microscopy. Infrared spectra of the size segregated aerosol showed strong absorbances due to ketone, alcohol, carboxylic acid and organonitrate functional groups. Absorbance features were relatively independent of particle size, with the exception of the carboxylic acid absorbances, which were found only in the largest aerosol size fractions. Molar loadings for each of the groups were estimated, based on model compound calibration standards. The molar loadings indicate that most aerosol species are multifunctional, with an average of one ketone group per molecule, an alcohol group in two of every three molecules and an organonitrate group in one of every three molecules.

Additional Information

© 1993 Published by Elsevier. This work was supported, in part, by National Science Foundation grant ATM-9003186 and by the Environmental Protection Agency under Assistance Agreement CR-812771, to the National Center for Intermedia Transport Research. Although the information in this document has been funded in part by the United States Environmental Protection Agency, it does not necessarily reflect the views of the agency and no official endorsement should be inferred.

Additional details

August 22, 2023
October 23, 2023