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Absolute line wavenumbers in the near infrared: 12C2H2 and 12C16O2

par Vander Auwera, Jean ;El Hachtouki, Rachid ;Brown, Linda
Référence Molecular Physics, 100, 22, page (3563-3576)
Publication Publié, 2002

Article révisé par les pairs

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Résumé :

40 absolute line wavenumbers in the 3v3 band of 12C16O2 between 6927cm-1 and 6989cm-1 and 626 absolute line wavenumbers in the near infrared absorption spectrum of 12C2H2 between 7060cm-1 and 9900cm-1 have been measured using high resolution Fourier transform spectroscopy. The calibration of the CO2 line wavenumbers relied on heterodyne frequencies available in the v1 + v3 band of 12C2H2 near 6556 cm-1. The absolute uncertainty of the calibrated acetylene line wavenumbers is estimated to 0.000 08 cm-1. The acetylene spectra were calibrated using heterodyne frequencies available in the 2-0 band of 12C16O and the line wavenumbers obtained in the 3v3 band of 12C16O2. The absolute uncertainty of the calibrated acetylene line wavenumbers is estimated to range from 0.0003 cm-1 to 0.006 cm-1 for strong to very weak isolated lines. Comparison with absolute line wavenumbers obtained independently at JPL in the 3v3 band of 12C2H2 near 9649 cm-1, calibrated using absolute wavenumbers available in the 2-0 and 3-0 (near 6350 cm-1) bands of 12C16O, shows very good agreement. Also, the vibration-rotation constants for the observed upper vibrational states of 12C2H2 were determined, but without accounting for the perturbations affecting these states.