= MP2 =
<<TableOfContents(4)>>

Moller-Plesset second order pertubration theory.

When the preceding SCF calculation is a HF calculation, a MP2 calculation is performed, giving the MP2 correlation energy. If the preceding SCF calculation is a DFT calculation with a double hybrid functional, the MP2 contribution to the double hybrid is computed, and the total double hybrid energy is printed.

For most purposes, no keywords need to be given, i.e., the following block shall suffice:
{{{
$mp2
$end
}}}

== General keywords ==

=== FSS ===

Same-spin scale factor for scaled MP2 approaches (e.g. SCS-MP2). Default: 1.0.

=== FOS ===

Opposite-spin scale factor for scaled MP2 approaches. Default: 1.0.

=== PCMO ===

=== LMO ===

=== paircut ===

=== nature ===

Calculate MP2 natural orbitals.

=== molden ===

=== iprtmo ===