Panwang Zhou
pwzhou@gmail.com
Recently I optimized some molecules with MCSCF and do the frequency calculation after the optimization. In some of the output files I found the following warning information:
* * * WARNING, MODE 7 HAS BEEN CHOSEN AS A VIBRATION
WHILE MODE 1 IS ASSUMED TO BE A TRANSLATION/ROTATION.
PLEASE VERIFY THE PROGRAM'S DECISION MANUALLY!
MODES 1 TO 6 ARE TAKEN AS ROTATIONS AND TRANSLATIONS.
FREQUENCIES IN CM**-1, IR INTENSITIES IN DEBYE**2/AMU-ANGSTROM**2
1 2 3 4 5
FREQUENCY: 37.38 11.03 4.32 1.41 0.83
REDUCED MASS: 4.04148 5.98182 6.38515 8.15107 8.04677
IR INTENSITY: 0.00767 0.02150 0.02270 0.12653 0.14352
6 7 8 9 10
FREQUENCY: 3.07 32.50 42.75 55.57 82.43
REDUCED MASS: 8.43095 2.01865 3.23463 2.39530 5.49036
IR INTENSITY: 0.13750 0.01437 0.02990 0.00877 0.04674
So, what's the meaning of this warning? Is it necessary to eliminate this warning and how to do? Thanks.
Following is my input file:
$CONTRL SCFTYP=MCSCF RUNTYP=OPTIMIZE EXETYP=RUN MAXIT=50 ICHARG=-1
MULT=1 FSTINT=.T. GENCON=.T. D5=.T. INTTYP=HONDO NOSYM=1
ICUT=11 ITOL=30 $END
$SYSTEM MWORDS=300 TIMLIM=60000.0 KDIAG=0 NOJAC=100 $END
$SCF DIRSCF=.T. FDIFF=.F. NCONV=8 $END
$P2P P2P=.T. DLB=.T. $END
$TRANS MPTRAN=2 DIRTRF=.T. AOINTS=DIST ALTPAR=.T. MODE=112 $END
$MCSCF CISTEP=ALDET FULLNR=.F. SOSCF=.T. $END
$DET NCORE=49 NACT=14 NELS=16 $END
$BASIS EXTFIL=.T. GBASIS=TZVP $END
$GUESS GUESS=MOREAD NORB=642 NORDER=1
IORDER(40)=50 IORDER(50)=40 IORDER(45)=52 IORDER(52)=45
IORDER(63)=64 IORDER(64)=63 $END
$STATPT NSTEP=200 METHOD=GDIIS OPTTOL=0.00001 HSSEND=.T. $END
$FORCE NVIB=2 $END