The total cross sections for the present set of targets is shown in fig. 1, 2 and 3 with the only available experimental measurements of Kimura et al. \cite{Kimura_2001}.  The present cross sections for the three molecules show a similar variation with increasing energy. These molecules have IPs around 10 eV, beyond which an increase in cross section is observed which is due to the addition of the contributions from various inelastic channels in the scattering process. However, at sufficiently high energy the interaction time between the target molecule and the projectile is adequately reduced and hence the cross sections which is well substantiated in the graph.
The present results overestimate the cross sections of Kimura et al. \cite{Kimura_2001} in the intermediate energies, though underestimates them above 40 eV. The MSCOP (multi-scattering centre spherical complex optical potential) formalism adopted to compute the present results may be a possible reason for the higher cross sections in the intermediate region. However, for CH3Br and CH3I, present data lie close to the error limits of the experimental cross sections of Kimura et al. \cite{Kimura_2001}. Nonetheless. the present results show a similar nature as that of the experimental measurements.
Furthermore, the paucity of data for the present set of molecules demand for more theoretical as well as experimental endeavors to be attempted to validate the present results.