  A new dipole moment surface (DMS) for methyl chloride has been generated at
the CCSD(T)/aug-cc-pVQZ(+d for Cl) level of theory. To represent the DMS, a
symmetry-adapted analytic representation in terms of nine vibrational
coordinates has been developed and implemented. Variational calculations of the
infrared spectrum of CH$_3$Cl show good agreement with a range of experimental
results. This includes vibrational transition moments, absolute line
intensities of the $\nu_1$, $\nu_4$, $\nu_5$ and $3\nu_6$ bands, and a
rotation-vibration line list for both CH$_{3}{}^{35}$Cl and CH$_{3}{}^{37}$Cl
including states up to $J=85$ and vibrational band origins up to
$4400{\,}$cm$^{-1}$. Across the spectrum band shape and structure are well
reproduced and computed absolute line intensities are comparable with highly
accurate experimental measurements for certain fundamental bands. We thus
recommend the DMS for future use.
