  Ro-vibrational spectra of the $\nu_3$ and $\nu_6$ bands of chloromethane
($\mathrm{CH_3Cl}$) 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 ($\mathrm{CH_3^{35}Cl}$ and
$\mathrm{CH_3^{37}Cl}$) 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).
