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 C2H3 (vinyl)

using model chemistry: PBEPBEultrafine/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 2A'
Energy calculated at PBEPBEultrafine/6-31G(2df,p)
 hartrees
Energy at 0K-77.792735
Energy at 298.15K-77.794183
HF Energy-77.792735
Nuclear repulsion energy28.258975
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 PBEPBEultrafine/6-31G(2df,p)
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A' 3195 3162 1.73      
2 A' 3087 3056 4.14      
3 A' 2987 2956 4.64      
4 A' 1623 1607 1.56      
5 A' 1345 1331 7.60      
6 A' 1007 997 10.93      
7 A' 678 671 24.64      
8 A" 885 876 63.67      
9 A" 781 773 4.85      

Unscaled Zero Point Vibrational Energy (zpe) 7794.2 cm-1
Scaled (by 0.9897) Zero Point Vibrational Energy (zpe) 7714.0 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 PBEPBEultrafine/6-31G(2df,p)
ABC
7.83349 1.07332 0.94398

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBEultrafine/6-31G(2df,p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.048 0.724 0.000
C2 0.048 -0.589 0.000
H3 -0.670 1.542 0.000
H4 -0.884 -1.179 0.000
H5 0.974 -1.177 0.000

Atom - Atom Distances (Å)
  C1 C2 H3 H4 H5
C11.31271.08862.11892.1145
C21.31272.24851.10311.0970
H31.08862.24852.72933.1774
H42.11891.10312.72931.8579
H52.11451.09703.17741.8579

picture of vinyl state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H4 122.350 C1 C2 H5 122.424
C2 C1 H3 138.718 H4 C2 H5 115.226
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBEultrafine/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.144      
2 C -0.301      
3 H 0.159      
4 H 0.142      
5 H 0.144      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.552 -0.274 0.000 0.616
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -12.009 -1.067 0.000
y -1.067 -10.988 0.000
z 0.000 0.000 -14.151
Traceless
 xyz
x 0.561 -1.067 0.000
y -1.067 2.092 0.000
z 0.000 0.000 -2.652
Polar
3z2-r2-5.305
x2-y2-1.020
xy-1.067
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.716 -0.227 0.000
y -0.227 4.569 0.000
z 0.000 0.000 1.728


<r2> (average value of r2) Å2
<r2> 20.318
(<r2>)1/2 4.508