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Measurements of benzene concentration based on high-resolution laser absorption spectroscopy by use of the R(6) transition in the nu(4) fundamental vibrational band near 14.8 mum (676.6 cm(-1)) are reported. These measurements were performed with a tunable continuous-wave, mid-infrared spectroscopic light source that employs difference-frequency mixing of two Ti:sapphire lasers in a GaSe nonlinear optical crystal. A minimum benzene concentration detection of ~11.5 parts in 10(6) was realized at a reduced pressure of 40 mbars.
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Chen et al. (2000) studied this question.
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