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 CH3CO (Acetyl radical)

using model chemistry: B3LYP/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 2A'
Energy calculated at B3LYP/3-21G*
 hartrees
Energy at 0K-152.329827
Energy at 298.15K-152.332082
HF Energy-152.329827
Nuclear repulsion energy62.038097
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 B3LYP/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' 805 774 6.18      
2 A' 434 417 3.67      
3 A" 3129 3011 1.19      
4 A" 1524 1466 16.89      
5 A" 999 961 0.94      
6 A" 125 120 2.86      
7 A' 3126 3007 8.29      
8 A' 3043 2927 6.48      
9 A' 1843 1773 79.81      
10 A' 1522 1464 25.61      
11 A' 1415 1361 23.19      
12 A' 1066 1025 15.57      

Unscaled Zero Point Vibrational Energy (zpe) 9514.5 cm-1
Scaled (by 0.962) Zero Point Vibrational Energy (zpe) 9152.9 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 B3LYP/3-21G*
ABC
2.85705 0.31923 0.30339

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/3-21G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.987 -0.672 0.000
C2 0.000 0.487 0.000
O3 1.207 0.489 0.000
H4 -0.481 -1.644 0.000
H5 -1.628 -0.579 0.883
H6 -1.628 -0.579 -0.883

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6
C11.52202.48251.09611.09491.0949
C21.52201.20732.18482.13642.1364
O32.48251.20732.72093.15553.1555
H41.09612.18482.72091.79701.7970
H51.09492.13643.15551.79701.7659
H61.09492.13643.15551.79701.7659

picture of Acetyl radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 O3 130.542 C2 C1 H4 112.102
C2 C1 H5 108.350 C2 C1 H6 108.350
H4 C1 H5 110.203 H4 C1 H6 110.203
H5 C1 H6 107.495
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.682      
2 C 0.350      
3 O -0.378      
4 H 0.225      
5 H 0.242      
6 H 0.242      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -2.034 -1.416 0.000 2.478
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -18.896 -0.147 0.000
y -0.147 -18.491 0.000
z 0.000 0.000 -16.767
Traceless
 xyz
x -1.267 -0.147 0.000
y -0.147 -0.660 0.000
z 0.000 0.000 1.927
Polar
3z2-r23.855
x2-y2-0.405
xy-0.147
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 3.890 0.450 0.000
y 0.450 2.840 0.000
z 0.000 0.000 2.341


<r2> (average value of r2) Å2
<r2> 45.287
(<r2>)1/2 6.730