CO2 Emission in the 4-µm Region

From spectra recorded at a resolution of 0.020 cm-1 of the flame CH4 + O2 at low pressure, six new vibrational transitions in Deltav3 = 1 with 2v1 + v2 = 5 had been recently identified [D. Bailly et al., J. Mol. Spectrosc. 182, 10-17 (1996)] based on the HITRAN 92 predictions. New calculations have shown good consistency with our assignments except for one transition, namely, (21(1)1)3e --> (21(1)0)3e for which discrepancies (reaching 0.2 cm-1) were found. It has been possible to resolve this issue using new emission spectra of CO2, vibrationally excited by active nitrogen and recorded with a Fourier transform spectrometer at a resolution of 6.3 x 10(-3) cm-1 in the 4-5 µm spectral region. Copyright 1998 Academic Press.