Abstract

Photoacoustic spectroscopic studies on a mixture of six CO₂ isotopes (¹²C¹⁶O₂, ¹²C¹⁸O₂, ¹³C¹⁶O₂, ¹³C¹⁸O₂, ¹⁶O¹²C¹⁸O, and ¹⁶O¹³C¹⁸O) in the wavelength range of 9–11 µm by use of a home-built high-pressure continuously tunable CO₂ laser with a bandwidth of 0.017 cm^-1 are discussed. The concentrations of all CO₂ isotopes present in the mixture could be determined with good accuracy. Furthermore, the previously unknown absorption cross sections of some important lines of the ¹²C¹⁸O₂, ¹³C¹⁸O₂, and ¹⁶O¹³C¹⁸O isotopes in the 9–11-µm range are reported.

© 1997 Optical Society of America

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