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All results from a given calculation for C2H2O (Oxirene)

using model chemistry: HF/aug-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 HF/aug-cc-pVTZ
 hartrees
Energy at 0K-151.649239
Energy at 298.15K 
HF Energy-151.649239
Nuclear repulsion energy62.807295
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 HF/aug-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 3569 3249 3.75 58.48 0.22 0.36
2 A1 1973 1796 4.93 127.69 0.08 0.16
3 A1 1170 1065 21.14 7.22 0.71 0.83
4 A1 998 909 87.67 8.84 0.74 0.85
5 A2 829 755 0.00 10.37 0.75 0.86
6 B1 692 630 102.00 0.14 0.75 0.86
7 B2 3484 3172 62.99 13.12 0.75 0.86
8 B2 1109 1010 5.40 1.97 0.75 0.86
9 B2 455 414 3.00 11.70 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 7138.9 cm-1
Scaled (by 0.9104) Zero Point Vibrational Energy (zpe) 6499.2 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 HF/aug-cc-pVTZ
ABC
1.15521 0.93181 0.51578

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/aug-cc-pVTZ

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.869
C2 0.000 0.620 -0.451
C3 0.000 -0.620 -0.451
H4 0.000 1.631 -0.768
H5 0.000 -1.631 -0.768

Atom - Atom Distances (Å)
  O1 C2 C3 H4 H5
O11.45831.45832.31092.3109
C21.45831.24031.05952.2734
C31.45831.24032.27341.0595
H42.31091.05952.27343.2621
H52.31092.27341.05953.2621

picture of Oxirene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 C3 64.833 O1 C2 H4 132.583
O1 C3 C2 64.833 O1 C3 H5 132.583
C2 O1 C3 50.334 C2 C3 H5 162.584
C3 C2 H4 162.584
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/aug-cc-pVTZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.480      
2 C -0.360      
3 C -0.360      
4 H 0.599      
5 H 0.599      


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 -2.504 2.504
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -18.798 0.000 0.000
y 0.000 -11.469 0.000
z 0.000 0.000 -19.308
Traceless
 xyz
x -3.409 0.000 0.000
y 0.000 7.584 0.000
z 0.000 0.000 -4.175
Polar
3z2-r2-8.350
x2-y2-7.329
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.961 0.000 0.000
y 0.000 4.723 0.000
z 0.000 0.000 3.707


<r2> (average value of r2) Å2
<r2> 29.918
(<r2>)1/2 5.470