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: QCISD(T)/daug-cc-pVDZ

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)/daug-cc-pVDZ
 hartrees
Energy at 0K-152.117322
Energy at 298.15K 
HF Energy-151.603734
Nuclear repulsion energy60.252448
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)/daug-cc-pVDZ
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 3380 3380        
2 A1 1731 1731        
3 A1 1032 1032        
4 A1 841 841        
5 A2 490 490        
6 B1 473 473        
7 B2 3314 3314        
8 B2 924 924        
9 B2 94i 94i        

Unscaled Zero Point Vibrational Energy (zpe) 6044.3 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 6044.3 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)/daug-cc-pVDZ
ABC
1.07196 0.84931 0.47387

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.910
C2 0.000 0.647 -0.472
C3 0.000 -0.647 -0.472
H4 0.000 1.677 -0.809
H5 0.000 -1.677 -0.809

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5
O11.52611.52612.40132.4013
C21.52611.29481.08302.3484
C31.52611.29482.34841.0830
H42.40131.08302.34843.3534
H52.40132.34841.08303.3534

picture of Oxirene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C3 64.897 O1 C2 H4 133.234
O1 C3 C2 64.897 O1 C3 H5 133.234
C2 O1 C3 50.205 C2 C3 H5 161.869
C3 C2 H4 161.869
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability