Abstract
A diode-laser-based technique has been developed for absolute line strength measurements with high precision and accuracy, combining a spectroscopic determination of the integrated absorbance with an optical measurement of the absorption path length by means of a Michelson interferometer. This method has been applied to several ${}^{12}{\mathrm{C}}^{16}{\mathrm{O}}_{2}$ vibrorotational transitions belonging to the ${\ensuremath{\nu}}_{1}+2{\ensuremath{\nu}}_{2}^{0}+{\ensuremath{\nu}}_{3}$ combination band, in the spectral region around 2 \ensuremath{\mu}m. The 1\ensuremath{\sigma} overall accuracy in line strength determination ranges between $0.4%$ and $0.7%,$ while the experimental reproducibility is estimated to be around $0.1%.$ To our knowledge, these levels are the highest ever reached before. The pressure-broadening coefficients for the same transitions are also reported.
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