Abstract

Aromatic hydrocarbons can be detected at subpicogram levels under conditions of high spectral resolution when the sample is placed in an aromatic crystal with molecular dimensions matched to the analyte. The advantages of using a low-temperature parent-molecule matrix have been assessed by comparing the laser-induced fluorescence and two-photon excitation of fluorescence spectra of methylnaphthalene, chloronaphthalene, and hydroxy-naphthalene derivatives in durene and naphthalene crystals. It has been demonstrated that the parent-molecule matrix is well suited for use with its derivatives and that sharp spectral features result for a wide variety of substituents and substitution positions. The vapor-deposition procedure that has been developed is characterized by high spectral resolution and good quantitative precision and is often essential for detecting subpicogram levels. The potential of two-photon excitation of fluorescence for trace analysis has also been explored.

© 1985 Optical Society of America

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