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It is possible to import the second-quantised hamiltonian completely
from outside MOLPRO. In order to do so, it is necessary to
set up a job that simulates the desired calculation by having a basis
set of exactly the same dimensions as the one to be imported. One can
then import the hamiltonian using the command
14.2 Imported hamiltonian
filename is the name of a file that contains the hamiltonian in
format, which can be produced using Molpro's
facility, or by another method.
Note that this facility is fragile, and is limited to energy-only
calculations. Attempts to calculate gradients or other properties will
inevitably fail. At present, the implementation does not support the
use of point-group symmetry.