return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for HCO (Formyl radical)

using model chemistry: MP4/6-311G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 2A'
Energy calculated at MP4/6-311G*
 hartrees
Energy at 0K-113.610915
Energy at 298.15K-113.610767
HF Energy-113.274624
Nuclear repulsion energy26.231866
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 MP4/6-311G*
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' 2606 2499        
2 A' 1876 1800        
3 A' 1124 1078        

Unscaled Zero Point Vibrational Energy (zpe) 2803.2 cm-1
Scaled (by 0.959) Zero Point Vibrational Energy (zpe) 2688.2 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 MP4/6-311G*
ABC
22.53663 1.47071 1.38061

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP4/6-311G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.064 0.594 0.000
H2 -0.890 1.206 0.000
O3 0.064 -0.596 0.000

Atom - Atom Distances (Å)
  C1 H2 O3
C11.13291.1896
H21.13292.0385
O31.18962.0385

picture of Formyl radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 C1 O3 122.721
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability