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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 53,
  • Issue 11,
  • pp. 1459-1469
  • (1999)

The Red-Shift Cascade: Investigations into the Concentration-Dependent Wavelength Shifts in Three-Dimensional Fluorescence Spectra of Petroleum Samples

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Abstract

Samples of motor oil and creosote are subjected to three-dimensional fluorescence spectroscopy to document the shifting of excitation/emission maxima as the solutions undergo serial dilutions. Effects such as self-quenching of individual polycyclic aromatic hydrocarbons (PAHs) and energy transfer between PAHs combine to produce large red-shifts in the resulting fluorescence emission spectra. The concentration-imposed complications are also demonstrated for several synthetic ternary PAH mixtures and a diesel residue mimic.

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