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

40 absolute line wavenumbers in the 3nu(3) band of (CO2)-C-12-O-16 between 6927 cm-(1) and 6989 cm-(1) and 626 absolute line wavenumbers in the near infrared absorption spectrum of (C2H2)-C-12 between 7060 cm-(1) and 9900 cm-(1) have been measured using high resolution Fourier transform spectroscopy. The calibration of the CO2 line wavenumbers relied on heterodyne frequencies available in the nu(1) + nu(3) band of (C2H2)-C-12 near 6556 cm-(1). The absolute uncertainty of the calibrated CO2 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 (CO)-C-12-O-16 and the line wavenumbers obtained in the 3nu(3) band of (CO2)-C-12-O-16. 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 3nu(3) band of (C2H2)-C-12 near 9649 cm-(1), calibrated using absolute wavenumbers available in the 2-0 and 3-0 (near 6350 cm-(1)) bands of (CO)-C-12-O-16, shows very good agreement. Also, the vibration-rotation constants for the observed upper vibrational states of (C2H2)-C-12 were determined, but without accounting for the perturbations affecting these states.