Overtone Transitions of12CO2beyond the Venus Bands

The 2ν1 + 5ν3 Triad of 12CO2

“…They complete our recent investigation of the 1 ϩ 5 3 dyad near 12 700 cm Ϫ1 (10). After submission of this note, the observation of the three components of the 2 1 ϩ 5 3 triad by optoacoustic spectroscopy was reported by Yang and Noda (11). The spectra, recorded at a pressure of 1 atm, does not show regular rotational structure and the band origin derived by rotational simulation is shifted by about 2 cm Ϫ1 from both our values and the calculated band origins obtained by these authors from the work of Courtoy (12).…”

Variational Calculations of Rovibrational Energies for CO2

“…Consequently the rms deviation for the vibrational frequencies of the ⌺ states, including those with values above 10 000 cm Ϫ1 , slightly increase up to 0.519 cm Ϫ1 . We should note as well that Yang and Noda have recently observed the CO 2 overtone transitions for the states (4, 0 0 , 3) 2,3,4 and (2, 0 0 , 5) 1,2,3 using optoacoustic spectroscopy (4). The uncertainty of the measured band origins for these transitions is 1-2 cm Ϫ1 .…”

“…Recent experimental studies of the spectra of this molecule include the observation of combination overtone transitions of the 12 C 16 O 2 and 13 C 16 O 2 species in the near-infrared (11 700 -14 200 cm Ϫ1 ) by intracavity laser absorption spectroscopy (ICLAS) (1,2) and by photoacoustic spectroscopy (PS) (3,4), and the measurement of CO 2 emission lines in the 4 -5 and 13-18 m spectral regions by Fourier transform spectroscopy (FTS) from CH 4 ϩ O 2 low-pressure flames (5,6) and from CO 2 ϩ N 2 mixtures excited by dc discharges (7)(8)(9)(10)(11)(12).…”

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

“…While the relative weak bands 4003i-00001 (i¼1, 2, 3, 4, 5) of the Fermi pentad of 12 C 16 O 2 near 830 nm have never been quantitatively studied. Only the band-heads of the three strongest bands of this Fermi pentad were observed with photo-acoustic spectroscopy [7]. The calculated line parameters of these bands are included in the latest GEISA database [8] and AMES line list [9].…”