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: MP2/6-311G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 2A'
Energy calculated at MP2/6-311G*
 hartrees
Energy at 0K-152.777616
Energy at 298.15K-152.779857
HF Energy-152.332500
Nuclear repulsion energy62.784678
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 MP2/6-311G*
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' 3190 3032 7.06      
2 A' 3082 2929 5.37      
3 A' 1949 1853 127.74      
4 A' 1503 1428 22.47      
5 A' 1394 1325 20.89      
6 A' 1075 1022 18.87      
7 A' 882 838 4.54      
8 A' 471 448 5.09      
9 A" 3196 3038 1.64      
10 A" 1498 1424 16.03      
11 A" 977 928 0.04      
12 A" 86 82 1.70      

Unscaled Zero Point Vibrational Energy (zpe) 9652.1 cm-1
Scaled (by 0.9503) Zero Point Vibrational Energy (zpe) 9172.3 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 MP2/6-311G*
ABC
2.76241 0.33174 0.31338

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-311G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.969 -0.666 0.000
C2 0.000 0.503 0.000
O3 1.182 0.472 0.000
H4 -0.433 -1.620 0.000
H5 -1.607 -0.588 0.881
H6 -1.607 -0.588 -0.881

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6
C11.51792.43381.09401.09091.0909
C21.51791.18292.16642.13302.1330
O32.43381.18292.64363.11193.1119
H41.09402.16642.64361.79431.7943
H51.09092.13303.11191.79431.7619
H61.09092.13303.11191.79431.7619

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 128.189 C2 C1 H4 111.038
C2 C1 H5 108.584 C2 C1 H6 108.584
H4 C1 H5 110.412 H4 C1 H6 110.412
H5 C1 H6 107.718
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability