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#! 6-31G* C2 Test RASCI Energy Point, testing two different ways of
#! specifying the active space, either with the ACTIVE keyword, or
#! with RAS1, RAS2, RESTRICTED_DOCC, and RESTRICTED_UOCC

refnuc   =  15.2403036073920  #TEST
refscf   = -75.3870408916852  #TEST
refci    = -75.5535266390568  #TEST
refcorr  = refci - refscf     #TEST

molecule c2 {
  C
  C 1 1.25
}

set {
  wfn detci
  guess gwh
  basis cc-pVDZ
  e_convergence 10
  d_convergence 10
  restricted_docc [1, 0, 0, 0, 0, 1, 0, 0]
  active          [2, 0, 1, 1, 0, 2, 1, 1]
}

thisenergy = energy('detci')

compare_values(refnuc, c2.nuclear_repulsion_energy(), 9, "Nuclear repulsion energy") #TEST 
compare_values(refscf, get_variable("SCF total energy"),     9, "SCF energy") #TEST
compare_values(refci, thisenergy,                      7, "CI energy") #TEST
compare_values(refcorr, get_variable("CI CORRELATION ENERGY"), 7, "CI correlation energy") #TEST

clean()
revoke_global_option_changed("ACTIVE")


# The following is an alternative way of specifying exactly the same CI
set {
  wfn detci
  basis cc-pVDZ
  restricted_docc [1, 0, 0, 0, 0, 1, 0, 0]
  restricted_uocc [4, 1, 2, 2, 1, 4, 2, 2]
  ras1            [1, 0, 0, 0, 0, 1, 1, 1]
  ras2            [1, 0, 1, 1, 0, 1, 0, 0]
  ex_level 2
  val_ex_level 6
}

thisenergy = energy('detci')

compare_values(refnuc, c2.nuclear_repulsion_energy(), 9, "Nuclear repulsion energy") #TEST 
compare_values(refscf, get_variable("SCF total energy"),     9, "SCF energy") #TEST
compare_values(refci, thisenergy,                      7, "CI energy") #TEST
compare_values(refcorr, get_variable("CI CORRELATION ENERGY"), 7, "CI correlation energy") #TEST