  Calculations are performed for electron collision with the methylene
molecular ion CH$_2^+$ in its bent equilibrium geometry, with the goal to
obtain cross sections for electron impact excitation and dissociation. The
polyatomic version of the UK molecular R-matrix codes was used to perform an
initial configuration-interaction calculation on the doublet and quartet states
of the CH$_2^+$ ion. Subsequently, scattering calculations are performed to
obtain electron impact electronic excitation and dissociation cross sections
and, additionally, the bound states of the CH$_2$ molecule and Feshbach
resonances in the $e$-CH$_2^+$ system.
