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/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 QCISD/3-21G
 hartrees
Energy at 0K-151.752228
Energy at 298.15K-151.754445
HF Energy-151.434607
Nuclear repulsion energy61.314564
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/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' 779 755 10.66      
2 A' 437 424 4.74      
3 A" 3119 3023 4.19      
4 A" 1546 1498 11.93      
5 A" 1009 978 0.35      
6 A" 105 101 0.91      
7 A' 3111 3016 7.91      
8 A' 3032 2938 5.67      
9 A' 1553 1506 18.28      
10 A' 1497 1451 5.21      
11 A' 1407 1364 3.15      
12 A' 1070 1037 13.24      

Unscaled Zero Point Vibrational Energy (zpe) 9332.6 cm-1
Scaled (by 0.9692) Zero Point Vibrational Energy (zpe) 9045.2 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/3-21G
ABC
2.77098 0.31215 0.29631

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -1.006 -0.673 0.000
C2 0.000 0.499 0.000
O3 1.226 0.482 0.000
H4 -0.483 -1.639 0.000
H5 -1.642 -0.588 0.890
H6 -1.642 -0.588 -0.890

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6
C11.54482.51301.09921.09761.0976
C21.54481.22592.19242.16162.1616
O32.51301.22592.72363.18803.1880
H41.09922.19242.72361.80071.8007
H51.09762.16163.18801.80071.7809
H61.09762.16163.18801.80071.7809

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 129.826 C2 C1 H4 110.908
C2 C1 H5 108.596 C2 C1 H6 108.596
H4 C1 H5 110.116 H4 C1 H6 110.116
H5 C1 H6 108.447
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability