High-resolution Fourier spectra of carbon dioxide and three of its isotopic species near 4.3 μm

Abstract

Low-pressure, Doppler-limited absorption spectra of 16O 12C 16O, 16O 13C 16O, 16O 12C 17O, 16O 12C 18O have been recorded in the 4.3-μm region with a high-information Fourier transform interferometer operating in a vacuum. About 700 absolute wavenumbers achieving at least a tenfold improvement in accuracy over previous measurements are reported with an accuracy of the order of 0.12 × 10 −3 cm −1 (or 3.5 MHz). They may consequently be used as secondary standards. More than 70 molecular constants are reported in this paper.