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Site-Selection Fluorescence Spectrometry of Polycyclic Aromatic Hydrocarbons in Vapor-Deposited Argon Matrices

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Abstract:

The use of tunable laser excitation to effect significant sharpening in the inhomogeneously-broadened fluorescence spectra of polycyclic aromatic hydrocarbons (PAHs) isolated in argon matrices at 15 K is reported. The broad-band-excited fluorescence spectra of most PAHs in solid argon exhibit complex multiplet structures assumed due to the location of individual PAH molecules in different types of discrete "sites" in the polycrystalline matrix. Under laser excitation, the fluorescence spectra of PAHs are strongly dependent on excitation wavelength. For most PAHs, there exists an "optimum" excitation wavelength, at which a "single-site" fluorescence spectrum comprising one intense feature having a bandwidth of 50 cm−1 or less is obtained. The excitation and emission wavelengths for site-selection fluorescence of eleven PAHs matrix isolated in argon are tabulated, and the trade-offs implicit in choice of optimum excitation wavelengths for site-selection fluorometric detection of PAHs in multicomponent samples are addressed. Quantitative results for five constituents of a sixteen-component standard reference material exhibit excellent agreement with certified values.

Keywords: Fluorescence; Low-temperature spectroscopy; Matrix isolation; Polycyclic aromatic hydrocarbons; Site selection

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702884430281

Affiliations: 1: Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996; present address: Burroughs Wellcome Company, Greenville, NC 27834-1887 2: Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996; present address: Procter and Gamble Company, Miami Valley Laboratories, Cincinnati, OH 45239 3: Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996 4: Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996; present address: Biosym Technologies, San Diego, CA 92121

Publication date: August 1, 1988

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