Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5430393 | Journal of Quantitative Spectroscopy and Radiative Transfer | 2009 | 18 Pages |
Line intensities of 13C16O2 have been measured between 5851 and 6580 cmâ1 using CW-cavity ring down spectroscopy (CRDS) and in the 4700-5050 and 6050-6850 cmâ1 regions using Fourier transform spectroscopy. As a result of the high sensitivity (noise equivalent absorption αminâ¼3Ã10â10 cmâ1) and high dynamics allowed by CW-CRDS, accurate line intensities of 2039 transitions ranging between 1.1Ã10â28 and 1.3Ã10â23 cmâ1/(molecule cmâ2) were measured with an average accuracy of 4%. These transitions belong to a total of 48 bands corresponding to the ÎP=9 series of transitions. Additionally, unapodized absorption spectra of 13C-enriched samples have been recorded using a high-resolution Bruker IFS125HR Fourier transform spectrometer. Spectral resolutions of 0.004 cmâ1 (maximum optical path difference (MOPD)=225 cm) and 0.007 cmâ1 (MOPD=128.6 cm), and pressureÃpath length products in the ranges 5.2-12 and 69-450 hPaÃm have been used for the lower and higher energy spectral regions, respectively. Absolute line intensities have been measured in the 2001iâ00001, 3001iâ00001 (i=1, 2, 3) and 00031â00001 bands. An excellent agreement was achieved for the line intensities of the 3001iâ00001 (i=1, 2, 3) bands measured by both FTS and CW-CRDS. The CW-CRDS and FTS experimental intensity data together with selected intensity information from the literature have been fitted simultaneously using the effective operators approach. Two sets of effective dipole moment parameters have thus been obtained, which reproduce the observed line intensities in the 2.0 and 1.6 μm regions within experimental uncertainties.