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All results from a given calculation for C2H2O (Oxirene)

using model chemistry: MP4/STO-3G

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/STO-3G
 hartrees
Energy at 0K-149.842344
Energy at 298.15K-149.843385
HF Energy-149.614951
Nuclear repulsion energy59.479960
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/STO-3G
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 3566 3566        
2 A1 1808 1808        
3 A1 1270 1270        
4 A1 938 938        
5 A2 698 698        
6 B1 557 557        
7 B2 3489 3489        
8 B2 1035 1035        
9 B2 603 603        

Unscaled Zero Point Vibrational Energy (zpe) 6981.6 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 6981.6 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 MP4/STO-3G
ABC
1.06182 0.81512 0.46113

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP4/STO-3G

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.930
C2 0.000 0.655 -0.469
C3 0.000 -0.655 -0.469
H4 0.000 1.662 -0.908
H5 0.000 -1.662 -0.908

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5
O11.54431.54432.47762.4776
C21.54431.31081.09812.3586
C31.54431.31082.35861.0981
H42.47761.09812.35863.3238
H52.47762.35861.09813.3238

picture of Oxirene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C3 64.888 O1 C2 H4 138.683
O1 C3 C2 64.888 O1 C3 H5 138.683
C2 O1 C3 50.224 C2 C3 H5 156.429
C3 C2 H4 156.429
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability