High-resolution far-infrared spectroscopy and analysis of the $\nu$3 and $\nu$6 bands of chloromethane

Abstract

Ro-vibrational spectra of the ${\nu }_3$ and ${\nu }_6$ bands of chloromethane ($\mathrm{C}{\mathrm{H}}_3\mathrm{Cl}$) were recorded in the 650--1130 ${\mathrm{cm}}^{-1}$ range using a Fourier transform spectrometer at the AILES beamline of the SOLEIL synchrotron facility. Two isotopologues ($\mathrm{C}{\mathrm{H}}_3^{35}\mathrm{Cl}$ and $\mathrm{C}{\mathrm{H}}_3^{37}\mathrm{Cl}$) have been analyzed with the tensorial formalism developed in Dijon and a total of 6753 lines were assigned. We derived 23 tensorial parameters for the lines positions (4 for the ground state, 6 for ${\nu }_3$, and 13 for ${\nu }_6$), and 7 for the lines intensities (4 for ${\nu }_3$, 3 for ${\nu }_6$). From those parameters and self-broadening coefficients found in the literature, we simulated spectra of both isotopologues. The derived parameters were converted in the Watson formalism to be compared with a previous study. Using these results, we set up a new database of calculated chloromethane spectral lines (ChMeCaSDa).

Journal of Quantitative Spectroscopy & Radiative Transfer, In press