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: CCD/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 CCD/3-21G
 hartrees
Energy at 0K-151.742053
Energy at 298.15K-151.744284
HF Energy-151.437043
Nuclear repulsion energy61.848995
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 CCD/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' 769 747 7.07      
2 A' 444 432 4.25      
3 A" 3131 3045 2.53      
4 A" 1549 1506 14.22      
5 A" 1011 983 0.05      
6 A" 105 102 1.88      
7 A' 3129 3042 7.81      
8 A' 3047 2962 3.13      
9 A' 2228 2167 702.59      
10 A' 1544 1502 20.63      
11 A' 1438 1398 23.62      
12 A' 1077 1048 26.69      

Unscaled Zero Point Vibrational Energy (zpe) 9735.7 cm-1
Scaled (by 0.9723) Zero Point Vibrational Energy (zpe) 9466.0 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 CCD/3-21G
ABC
2.82013 0.31612 0.30039

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.984 -0.696 0.000
C2 0.000 0.496 0.000
O3 1.200 0.510 0.000
H4 -0.454 -1.658 0.000
H5 -1.621 -0.611 0.889
H6 -1.621 -0.611 -0.889

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6
C11.54602.49521.09791.09711.0971
C21.54601.20012.20112.15542.1554
O32.49521.20012.72683.16373.1637
H41.09792.20112.72681.80221.8022
H51.09712.15543.16371.80221.7777
H61.09712.15543.16371.80221.7777

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 130.207 C2 C1 H4 111.593
C2 C1 H5 108.067 C2 C1 H6 108.067
H4 C1 H5 110.384 H4 C1 H6 110.384
H5 C1 H6 108.236
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability