Abstract
Significant line-narrowing has been observed in the laser-induced fluorescence spectra of naphthalene and perylene in direct supersonic expansions of simple supercritical carriers such as CO<sub>2</sub>, N<sub>2</sub>O, and even SF<sub>6</sub>, under conditions which minimize aerosol and cluster formation. Clusters form readily in expansions of CO<sub>2</sub> and N<sub>2</sub>O unless nozzle temperatures exceed about 200°C. Results with more complex carriers, such as <i>n</i>-pentane, are much poorer. Selective detection of perylene at a limit of 2 ng (S/N = 3) in a mixture of ten polycyclic aromatic hydrocarbons and in a coal tar extract has been achieved with a capillary introduction system. Challenges with coupling supersonic jet detection to capillary supercritical fluid chromatography lie with the nozzle.
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