||Tunable Atomic Line Molecular Spectroscopy of Benzene: Signals with Hg 253.7 nm and Co 252.8 nm Lines.
Hadeishi, T. ;
McLaughlin, R. ;
Conway, J. ;
Scott, D. R. ;
||California Univ., Berkeley. Lawrence Berkeley Lab.;Environmental Monitoring Systems Lab., Research Triangle Park, NC.
Emission spectroscopy ;
Absorption spectra ;
Atomic spectra ;
Zeeman effect ;
Tunable atomic line molecular spectroscopy ;
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A method of locating appropriate atomic emission lines for the detection of complex molecules, e.g. benzene, with the TALMS technique is described. Atomic emission spectra are superimposed upon medium to high resolution absorption spectrograms of the molecules. It is then possible to calculate relative sensitivities associated with the various absorption features from the Zeeman splitting patterns and the absorption spectra. The TALMS signal is shown to be determined by the extinction coefficient difference, delta E, a concentration independent parameter. Delta E for benzene at the Co 252.8 nm and Hg 253.7 nm lines is estimated to be 100 and 8.4 respectively. The experimental TALMS signals using these lines are in the ratio 35:1. (Copyright (c) 1983 American Chemical Society.)