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: CCSD=FULL/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=FULL/daug-cc-pVTZ
 hartrees
Energy at 0K-152.270651
Energy at 298.15K 
HF Energy-151.648095
Nuclear repulsion energy61.830896
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=FULL/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 3417 3417 3.46      
2 A1 1826 1826 3.41      
3 A1 1103 1103 14.51      
4 A1 909 909 57.16      
5 A2 656 656 0.00      
6 B1 551 551 79.13      
7 B2 3338 3338 50.42      
8 B2 985 985 6.79      
9 B2 305 305 1.04      

Unscaled Zero Point Vibrational Energy (zpe) 6543.7 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 6543.7 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=FULL/daug-cc-pVTZ
ABC
1.12286 0.89977 0.49951

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.884
C2 0.000 0.632 -0.458
C3 0.000 -0.632 -0.458
H4 0.000 1.643 -0.791
H5 0.000 -1.643 -0.791

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5
O11.48301.48302.34682.3468
C21.48301.26301.06522.2989
C31.48301.26302.29891.0652
H42.34681.06522.29893.2861
H52.34682.29891.06523.2861

picture of Oxirene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C3 64.796 O1 C2 H4 133.467
O1 C3 C2 64.796 O1 C3 H5 133.467
C2 O1 C3 50.407 C2 C3 H5 161.737
C3 C2 H4 161.737
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability