High sensitivity absorption spectroscopy of acetylene near 760 nm

The Cavity Ring-Down Spectra (CRDS) of acetylene were recorded in the 13,087-13,300 cm -1 range with the sensitivity of 3.4 x 10 -11 cm -1 . Four cold and six hot bands of 12 C 2 H 2 were assigned in these spectra. Only five of them were observed before. The v1 + 3 v3 + v41 band is the strongest one lying in this region. The line positions and intensities were recovered from the recorded spectra. The line intensities in this region are reported for the first time. The line positions were modeled using the traditional power series expression in terms of the angular momentum quantum number for an isolated band. The line intensities were modeled using the vibrational transition dipole moment squared and the Herman-Wallis parameters.