Abstract

Two distributed-feedback (InGaAsP) diode lasers were used to record high-resolution absorption spectra of the parallel and the perpendicular components of the 2ν 4 band of methyl chloride (CH3Cl) and the 2ν 3 band of methane (CH4) near 1.65 µm. The room-temperature absorption measurements, which were conducted in a multipass cell with a variable path length (878–1020 cm), were used to determine the mole fractions of the constituent gases and thus demonstrate species-specific, nonintrusive concentration measurements of species with overlapping spectra.

© 1997 Optical Society of America

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