return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for C2H2O (Oxirene)

using model chemistry: MP4=FULL/aug-cc-pVTZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at MP4=FULL/aug-cc-pVTZ
 hartrees
Energy at 0K-152.301702
Energy at 298.15K 
HF Energy-151.645538
Nuclear repulsion energy61.164303
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 MP4=FULL/aug-cc-pVTZ
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 3411 3306        
2 A1 1755 1701        
3 A1 1057 1024        
4 A1 866 839        
5 A2 622 603        
6 B1 509 493        
7 B2 3312 3211        
8 B2 950 921        
9 B2 198i 192i        

Unscaled Zero Point Vibrational Energy (zpe) 6141.6 cm-1
Scaled (by 0.9693) Zero Point Vibrational Energy (zpe) 5953.1 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 MP4=FULL/aug-cc-pVTZ
ABC
1.10953 0.87129 0.48804

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP4=FULL/aug-cc-pVTZ

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.899
C2 0.000 0.636 -0.466
C3 0.000 -0.636 -0.466
H4 0.000 1.648 -0.799
H5 0.000 -1.648 -0.799

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5
O11.50541.50542.36632.3663
C21.50541.27261.06552.3088
C31.50541.27262.30881.0655
H42.36631.06552.30883.2966
H52.36632.30881.06553.2966

picture of Oxirene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C3 64.996 O1 C2 H4 133.240
O1 C3 C2 64.996 O1 C3 H5 133.240
C2 O1 C3 50.008 C2 C3 H5 161.765
C3 C2 H4 161.765
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability