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: PBEPBE/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 PBEPBE/daug-cc-pVDZ
 hartrees
Energy at 0K-152.324090
Energy at 298.15K 
HF Energy-152.324090
Nuclear repulsion energy60.659022
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 PBEPBE/daug-cc-pVDZ
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A1 3328 3328 2.44 102.43 0.18 0.30
2 A1 1776 1776 3.37 95.61 0.08 0.15
3 A1 1030 1030 14.75 5.35 0.73 0.84
4 A1 851 851 56.06 5.58 0.69 0.81
5 A2 551 551 0.00 3.87 0.75 0.86
6 B1 482 482 82.25 0.01 0.75 0.86
7 B2 3254 3254 48.65 18.55 0.75 0.86
8 B2 903 903 7.78 3.09 0.75 0.86
9 B2 282i 282i 3.69 20.70 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5946.7 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 5946.7 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 PBEPBE/daug-cc-pVDZ
ABC
1.08679 0.86110 0.48044

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

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.904
C2 0.000 0.642 -0.468
C3 0.000 -0.642 -0.468
H4 0.000 1.672 -0.808
H5 0.000 -1.672 -0.808

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5
O11.51441.51442.39272.3927
C21.51441.28321.08472.3381
C31.51441.28322.33811.0847
H42.39271.08472.33813.3432
H52.39272.33811.08473.3432

picture of Oxirene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C3 64.934 O1 C2 H4 133.339
O1 C3 C2 64.934 O1 C3 H5 133.339
C2 O1 C3 50.131 C2 C3 H5 161.727
C3 C2 H4 161.727
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/daug-cc-pVDZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.411      
2 C 0.799      
3 C 0.799      
4 H -0.594      
5 H -0.594      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 -2.285 2.285
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.089 0.000 0.000
y 0.000 -11.981 0.000
z 0.000 0.000 -19.260
Traceless
 xyz
x -3.468 0.000 0.000
y 0.000 7.193 0.000
z 0.000 0.000 -3.725
Polar
3z2-r2-7.449
x2-y2-7.108
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.472 0.000 0.000
y 0.000 5.208 0.000
z 0.000 0.000 4.413


<r2> (average value of r2) Å2
<r2> 31.475
(<r2>)1/2 5.610