! EXAM34.
!   CIS treatment of excited states of formaldehyde.
!
!   EXCITED STATE 1's E=-113.7017742428, RMS=0.0290048
!   The S0->S1 transition dipole is (0,0,0.006029),
!   and the S0 -> S1 transition energy is 4.56 eV.
!
!   geometry optimization would lead in 18 steps to 
!   -113.7053624528, at r(CO)=1.2553, r(CH)=1.0854, 
!   a(HCO)= 117.74, with C's pyramidalization= 24.88.
!   This reproduces the fourth line of Table III in 
!   Foresman et al. J.Phys.Chem. 96, 135-149(1992),
!   using no frozen core orbitals in order to do so.
!   Since it is well known that the geometry of this
!   state lies within Cs symmetry, the initial guess
!   geometry below is very slightly bent into Cs.
!
 $contrl scftyp=rhf cityp=cis runtyp=gradient nzvar=6 $end
 $system timlim=1 $end
 $basis gbasis=n31 ngauss=6 ndfunc=1 npfunc=0 diffsp=.t. $end
 $guess  guess=huckel $end
 $cis    hamtyp=saps mult=1 nacore=0 nstate=1 iroot=1 $end
 $zmat   izmat(1)=1,1,2,  1,2,3,  1,2,4, 
                  2,1,2,3,  2,1,2,4,  4,1,2,4,3 $end
 $data
Formaldehyde CIS/6-31+G(d) 1(n->pi*) state optimization
Cs

O   8.0    .01  -.8669736159  .0
C   6.0    .0    .3455497481  .0
H   1.0  -0.01   .9295804473  .9376713430
 $end

Link to the log file of this example.
exam34 Log File