Subject: STATIC ELECTRON CORRELATION ENERGY

From: "E. Lewars" <[email-masked]>
Date: Fri, 30 Jul 1999 13:55:23 -0400 (EDT)

1999 July 30

                  DYNAMIC AND STATIC ELEC TRON CORRELATION ENERGY

 Correlation energy is sometimes divided into dynamic and static. Dynamic
CE is the deviation from the exact energy caused by not allowing electrons to
keep apart properly. It can be calculated ("recovered") by Moller-Plesset
(e.g. MP2, MP4) or configuration interaction calculations. Static CE is the
deviation from the exact energy caused by trying to represent a wavefunction
by just one determinant when at least two are really needed, as with a singlet
diradical.

QUESTION: Is it true that a common and correct way to handle static CE is
with multifererence configuration interaction (MRCI)?

  Thanks
    E. Lewars
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