Some observations about the MOLSCAT
  For calculation of cross sections for collisional transitions between
rotational levels in a molecule, a computer code, MOLSCAT has been developed by
Hutson \& Green (1994). For the transitions between rotational levels in
H$_2$CS due to collisions with He atom, we have calculated cross sections under
the CS approximation. In the MOLSCAT, there is provision to input more than one
values of total energies. Here, for example, we are interested in the cross
sections for total energy 11 cm$^{-1}$. The calculations have been done for the
single energy 11 cm$^{-1}$ and for eight combinations, having energies (11,
12), (12, 11), (10, 11), (11, 10), (11, 12, 13), (9, 10, 11), (10, 11, 12), (9,
10, 11, 12, 13) cm$^{-1}$. We have found that the cross sections for 11
cm$^{-1}$, in general, differ from one another in all the 9 calculations. The
reason for the difference in the results appears that the MOLSCAT uses the
intermediate data of calculations for one energy, in the calculations for other
energies. Under such circumstances, the possible suggestion can be to run the
MOLSCAT for a single energy at a time.
