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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