# Restarting SCF calculationsΒΆ

A DIRAC calculation can be restarted at various stages depending on the type of
calculation. In general it should be enough to give the archive file of a
previous calculation as an argument to the `pam`

script. DIRAC will then
find and use the available data for restart. Alternatively you can copy
restart files in using `pam --put`

and if DIRAC finds them in the scratch
directory, it will automatically restart from them. In general the program can
restart from

`DFCOEF`

Contains orbital coefficients in machine-readable format, and will be used for restarting the SCF procedure.`DFPCMO`

Contains orbital coefficients in human-readable format, and will be used for restarting the SCF procedure.`PAMFCK`

The Fock matrix. Will be used for restarting the SCF procedure.`AOPROPER`

Contains one-electron integrals.`X2CMAT`

Contains four- to two-component transformation matrices, and allows you to skip the transformation step of a two component calculation.