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All results from a given calculation for C2H2O (Oxirene)

using model chemistry: CCSD(T)/daug-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 CCSD(T)/daug-cc-pVTZ
 hartrees
Energy at 0K-152.247781
Energy at 298.15K 
HF Energy-151.645692
Nuclear repulsion energy61.146100
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 CCSD(T)/daug-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 3393 3393        
2 A1 1758 1758        
3 A1 1064 1064        
4 A1 872 872        
5 A2 584 584        
6 B1 504 504        
7 B2 3324 3324        
8 B2 958 958        
9 B2 188 188        

Unscaled Zero Point Vibrational Energy (zpe) 6321.6 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 6321.6 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 CCSD(T)/daug-cc-pVTZ
ABC
1.10326 0.87547 0.48813

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD(T)/daug-cc-pVTZ

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.896
C2 0.000 0.637 -0.465
C3 0.000 -0.637 -0.465
H4 0.000 1.656 -0.796
H5 0.000 -1.656 -0.796

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5
O11.50311.50312.36742.3674
C21.50311.27501.07072.3170
C31.50311.27502.31701.0707
H42.36741.07072.31703.3116
H52.36742.31701.07073.3116

picture of Oxirene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C3 64.906 O1 C2 H4 133.088
O1 C3 C2 64.906 O1 C3 H5 133.088
C2 O1 C3 50.188 C2 C3 H5 162.006
C3 C2 H4 162.006
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability