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return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for (Acetic acid)

using model chemistry: PBEPBE/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at PBEPBE/3-21G*
 hartrees
Energy at 0K-227.555514
Energy at 298.15K-227.560224
Nuclear repulsion energy118.658246
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/3-21G*
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' 3335 3180 3.34      
2 A' 3127 2982 4.24      
3 A' 3012 2872 0.65      
4 A' 1740 1660 162.92      
5 A' 1484 1415 21.71      
6 A' 1391 1327 44.02      
7 A' 1335 1273 18.68      
8 A' 1136 1083 160.29      
9 A' 957 912 95.06      
10 A' 818 780 2.21      
11 A' 542 517 38.27      
12 A' 392 374 4.28      
13 A" 3075 2932 2.81      
14 A" 1496 1426 12.67      
15 A" 1063 1013 10.20      
16 A" 673 642 115.35      
17 A" 540 515 23.53      
18 A" 73 70 1.47      

Unscaled Zero Point Vibrational Energy (zpe) 13093.7 cm-1
Scaled (by 0.9535) Zero Point Vibrational Energy (zpe) 12484.8 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/3-21G*
ABC
0.35791 0.30893 0.17119

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/3-21G*

Point Group is Cs

Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.669      
2 C 0.531      
3 O -0.441      
4 H 0.239      
5 H 0.247      
6 H 0.247      
7 O -0.507      
8 H 0.353      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -0.309 -1.320 0.000 1.356
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -18.947 -2.942 0.000
y -2.942 -27.363 0.000
z 0.000 0.000 -22.792
Traceless
 xyz
x 6.131 -2.942 0.000
y -2.942 -6.494 0.000
z 0.000 0.000 0.363
Polar
3z2-r20.725
x2-y28.417
xy-2.942
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.445 -0.159 0.000
y -0.159 4.292 0.000
z 0.000 0.000 2.352


<r2> (average value of r2) Å2
<r2> 72.738
(<r2>)1/2 8.529