The entry mp2 leads to a submenu which allows to set some
keywords for MP2 and RI-MP2 calculations, e.g. defining frozen
orbitals, maximum memory usage, or assign auxiliary basis sets for
RI-MP2 calculations, etc. If you want to use ricc2, you have to use
the entry cc2 and the submenu ricc2 in order to
assign MP2 as wavefunction model.
It covers all keywords required for rimp2
calculations, Mandatory for rimp2 runs is the specification of the
auxiliary basis set using the menu entry cbas. (Alternatively,
the rimp2prep tool can be used to set the keywords needed for
rimp2 calculations.)
Conventional MP2 calculations with mpgrad require a number of
additional settings for which it is recommended to invoke the
interactive tool mp2prep. For geometry optimizations with
jobex use nohup jobex -level mp2 -ri ...