CCL:G: Gaussian ZINDO ground state

[Jens Spanget-Larsen <spanget]=[ruc.dk>]

 Sent to CCL by: Jens Spanget-Larsen [spanget_-_ruc.dk]
 Dear Bahman,
the ZINDO-CIS ground state is identical to the SCF ground state.
 According to the Brillouin theorem, singly excited electronic
 configurations do not interact with the Hartree-Fock-SCF ground
 configuration. Doubly and higher excited configurations may mix with
 the
 ground configuration and lower the calculated ground state energy; this
 amounts to a consideration of electronic correlation effects.
 Yours, Jens >--<
  ------------------------------------------------------
  JENS SPANGET-LARSEN         Office:      +45 4674 2710
  Dept. of Science (18.1)     Fax:         +45 4674 3011
  Roskilde University         Mobile:      +45 2320 6246
  P.O.Box 260                 E-Mail:     spanget**ruc.dk
  DK-4000 Roskilde, Denmark   http://www.ruc.dk/~spanget
  ------------------------------------------------------
 Bahman Roostaei bahman.roostaei|a|utsa.edu wrote:
>  Sent to CCL by: "Bahman  Roostaei" [bahman.roostaei,,utsa.edu]
>  Hi everybody,
> As a newly entered individual into this field, I am trying to clear
>  out some
>  concepts for myself. My confusion is in Gaussian Zindo. The Gaussian
>  Zindo
>  includes some sort of CI calculation. Why Gaussian does not report the
>  CI
>  coefficients for the first eigenstate of the CI Hamiltonian ? it always
>  starts
>  with reporting the CI coefficients of the first excited state. am I
>  missing
>  something here ? is it because the ground state of the Zindo-CI is the
>  same as
>  HF ground state ? If that's true why the SCF density is not
>  diagonalized in the
>  output?
>  
>   Thanks.
>  Bahman.>