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: CCSD/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 CCSD/3-21G*
 hartrees
Energy at 0K-151.748820
Energy at 298.15K 
HF Energy-151.435858
Nuclear repulsion energy61.547559
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 CCSD/3-21G*
Rotational Constants (cm-1) from geometry optimized at CCSD/3-21G*
ABC
2.80289 0.31379 0.29813

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.998 -0.680 0.000
C2 0.000 0.496 0.000
O3 1.216 0.493 0.000
H4 -0.472 -1.645 0.000
H5 -1.635 -0.597 0.890
H6 -1.635 -0.597 -0.890

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6
C11.54242.50551.09891.09741.0974
C21.54241.21592.19252.15832.1583
O32.50551.21592.72433.17903.1790
H41.09892.19252.72431.80061.8006
H51.09742.15833.17901.80061.7798
H61.09742.15833.17901.80061.7798

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 130.186 C2 C1 H4 111.102
C2 C1 H5 108.514 C2 C1 H6 108.514
H4 C1 H5 110.137 H4 C1 H6 110.137
H5 C1 H6 108.365
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability