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: QCISD(T)/6-31G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 2A'
Energy calculated at QCISD(T)/6-31G**
 hartrees
Energy at 0K-152.772989
Energy at 298.15K-152.775198
HF Energy-152.300295
Nuclear repulsion energy62.469503
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 QCISD(T)/6-31G**
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' 873 819        
2 A' 465 436        
3 A" 3203 3002        
4 A" 1513 1418        
5 A" 973 912        
6 A" 74 70        
7 A' 3201 3000        
8 A' 3096 2902        
9 A' 1893 1774        
10 A' 1512 1417        
11 A' 1401 1313        
12 A' 1069 1002        

Unscaled Zero Point Vibrational Energy (zpe) 9635.9 cm-1
Scaled (by 0.9373) Zero Point Vibrational Energy (zpe) 9031.7 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 QCISD(T)/6-31G**
ABC
2.72139 0.32931 0.31071

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)/6-31G**

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.982 -0.652 0.000
C2 0.000 0.511 0.000
O3 1.198 0.449 0.000
H4 -0.451 -1.606 0.000
H5 -1.619 -0.572 0.881
H6 -1.619 -0.572 -0.881

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6
C11.52272.44241.09141.09021.0902
C21.52271.19932.16452.13812.1381
O32.44241.19932.63453.12303.1230
H41.09142.16452.63451.79151.7915
H51.09022.13813.12301.79151.7625
H61.09022.13813.12301.79151.7625

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 127.198 C2 C1 H4 110.706
C2 C1 H5 108.694 C2 C1 H6 108.694
H4 C1 H5 110.403 H4 C1 H6 110.403
H5 C1 H6 107.866
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability