Knowledge Bank

In the line of our activities aiming at providing reference spectroscopic information in the near infrared range, we measured absolute line intensities in 5 bands of acetylene observed around $1.5\mu$: the $\nu 1+\nu 3$ band and 3 hot bands involving excitation of the bending modes $\nu 4$ and $\nu 5$ of $\mathrm{<mrow\; data-mjx-texclass="ORD">12</mrow>}C2H2$ and the $\nu 1+\nu 5$ band of $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}C12CH2$. These measurements were performed on spectra recorded at a resolution of $0.009cm-1$ (Maximum Optical Path Difference = 100 cm) using a Bruker IFS120HR Fourier transform spectrometer. Five spectra were actually recorded at room temperature, with sample pressure - absorption path length products ranging from 0.67 to 2700 mbarxm. Results will be presented and discussed.