Laser-Excited Matrix-Isolation Molecular Fluorescence Spectrometry

Wehry, Ε. L.; Gore, Randy R.; Dickinson, Richard B.

doi:10.1007/978-1-4612-6009-7_10

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“…The interfacing of GC with MI fluorescence spectrometry also has been accomplished; for fluorometric examination of GC effluents, the conventional photomultiplier tube detector is replaced by a SIT vidicon to facilitate rapid acquisition of MI fluorescence spectra of individual GC fractions (30).…”

Section: Spectrometry Can Be Used To Identify Pahs In Coal Liquid mentioning

confidence: 99%

Characterization of Coal-Derived Materials by Matrix Isolation Spectroscopy

Wehry

Mamantov

1981

ACS Symposium Series

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The identification and quantitative determination of specific organic compounds in very complex samples is an area of intense current research activity in analytical chemistry. Optical spectroscopy (particularly UV-visible and infrared absorption and molecular fluorescence and phosphorescence techniques) has been used widely in organic analysis. Any optical spectroscopic technique to be used for characterization of a very complex sample, such as a coal-derived material, should exhibit very high sensitivity (so that trace constituents can be determined) and extremely great selectivity (so that fractionation and separation steps prior to the actual analysis can be held to the minimum number and complexity). To achieve high analytical selectivity, an analytical spectroscopic technique should produce highly structured and specific spectra useful for "fingerprinting purposes," as well as to minimize the extent of overlap of spectral bands due to different constituents of complex samples. In addition, the spectral behavior of any particular sample constituent (both the positions and intensities of the various bands) should be unaffected by the other constituents of the sample, irrespective of their identities and concentrations. Most "conventional" sampling techniques utilized in spectroscopic analysis fail to satisfy these admittedly stringent criteria.In order to maximize the selectivity of spectroscopic analysis without undue sacrifice of sensitivity, we have turned to the sampling technique of matrix isolation for the spectroscopic characterization of very complex samples.In the technique of matrix isolation (hereafter denoted "MI"), samples which are liquid or solid at room temperature are vaporized under vacuum, and then mixed with a large excess of a diluent gas (termed the "matrix gas") which in effect, is the "solvent" in the spectroscopic analysis.This gaseous mixture is then deposited on a cold surface for spectroscopic analysis as a solid.For most purposes, temperatures of 15 Κ (which can be obtained by use of commercial closed-cycle refrigerators) are satisfactory; for some specialized fluorescence experiments,

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Section: Spectrometry Can Be Used To Identify Pahs In Coal Liquid mentioning

confidence: 99%