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/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 QCISD/6-311G*
 hartrees
Energy at 0K-152.801492
Energy at 298.15K-152.803732
HF Energy-152.332566
Nuclear repulsion energy62.694484
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/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' 870 833 3.55      
2 A' 474 454 5.06      
3 A" 3145 3011 4.52      
4 A" 1489 1425 13.64      
5 A" 974 932 0.06      
6 A" 87 83 0.75      
7 A' 3139 3006 10.29      
8 A' 3043 2913 8.26      
9 A' 1916 1834 116.09      
10 A' 1494 1431 20.21      
11 A' 1392 1333 14.85      
12 A' 1069 1023 13.83      

Unscaled Zero Point Vibrational Energy (zpe) 9546.1 cm-1
Scaled (by 0.9574) Zero Point Vibrational Energy (zpe) 9139.5 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/6-311G*
ABC
2.76154 0.33010 0.31207

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.971 -0.668 0.000
C2 0.000 0.507 0.000
O3 1.184 0.472 0.000
H4 -0.424 -1.618 0.000
H5 -1.611 -0.595 0.884
H6 -1.611 -0.595 -0.884

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6
C11.52392.43791.09631.09431.0943
C21.52391.18472.16652.14302.1430
O32.43791.18472.63693.12023.1202
H41.09632.16652.63691.79931.7993
H51.09432.14303.12021.79931.7689
H61.09432.14303.12021.79931.7689

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 127.896 C2 C1 H4 110.491
C2 C1 H5 108.769 C2 C1 H6 108.769
H4 C1 H5 110.446 H4 C1 H6 110.446
H5 C1 H6 107.851
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability