Cavity ring-down spectroscopy of CO2 overtone bands near 830 nm

- Cavity ring-down spectra of 12C16O2 around 830 nm were measured.
- Line positions and intensities of transitions were obtained for three bands.
- The line positions predicted by the effective Hamiltonian model agree well with the measured values.

Three bands 4003i-00001 (i=2, 3, 4) of the Fermi pentad of 12C16O2 near 830 nm have been recorded with a continuous-wave cavity ring down spectrometer. A sensitivity at the 5×10-11 cm−1 level allowed us to obtain line positions and intensities of these very weak bands. The measured line intensities of these three bands together with those published for the 10051-00001 and 10052-00001 bands were used to obtain the effective dipole moment parameters of 12C16O2 for the ΔP=17 series of transitions, where P=2V1+V2+3V3 is a polyad number (Vi (i=1, 2, 3) are vibrational quantum numbers). Comparisons of the measured line positions and intensities of the 4003i-00001 (i=2, 3, 4) bands to those from the AMES and GEISA line lists are given.