return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for CH2CO (Ketene)

using model chemistry: QCISD(T)=FULL/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at QCISD(T)=FULL/6-31G*
 hartrees
Energy at 0K-152.191273
Energy at 298.15K-152.192302
HF Energy-151.721345
Nuclear repulsion energy57.930442
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at QCISD(T)=FULL/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 3217 3217        
2 A1 2211 2211        
3 A1 1443 1443        
4 A1 1164 1164        
5 B1 592 592        
6 B1 506 506        
7 B2 3316 3316        
8 B2 1016 1016        
9 B2 437 437        

Unscaled Zero Point Vibrational Energy (zpe) 6951.4 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 6951.4 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at QCISD(T)=FULL/6-31G*
ABC
9.43229 0.33579 0.32425

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)=FULL/6-31G*

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.222
C2 0.000 0.000 0.100
O3 0.000 0.000 1.281
H4 0.000 0.942 -1.758
H5 0.000 -0.942 -1.758

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5
C11.32162.50221.08391.0839
C21.32161.18062.08342.0834
O32.50221.18063.18153.1815
H41.08392.08343.18151.8833
H51.08392.08343.18151.8833

picture of Ketene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 O3 180.000 C2 C1 H4 119.685
C2 C1 H5 119.685 H4 C1 H5 120.629
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability