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All results from a given calculation for CHBr2 (dibromomethyl radical)

using model chemistry: QCISD/6-31G*

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/6-31G*
 hartrees
Energy at 0K-5178.533772
Energy at 298.15K 
HF Energy-5178.170408
Nuclear repulsion energy336.113231
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/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
A' 3257 3102 1.21      
A' 629 599 11.36      
A' 484 461 18.54      
A' 190 181 0.05      
A" 1214 1156 57.09      
A" 762 726 103.38      

Unscaled Zero Point Vibrational Energy (zpe) 3268.2 cm-1
Scaled (by 0.9523) Zero Point Vibrational Energy (zpe) 3112.4 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/6-31G*
ABC
1.21313 0.04082 0.03953

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.007 0.859 0.000
H2 -0.528 1.802 0.000
Br3 0.007 -0.099 1.617
Br4 0.007 -0.099 -1.617

Atom - Atom Distances (Å)
  C1 H2 Br3 Br4
C11.08471.87971.8797
H21.08472.55302.5530
Br31.87972.55303.2342
Br41.87972.55303.2342

picture of dibromomethyl radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
H2 C1 Br3 116.325 H2 C1 Br4 116.325
Br3 C1 Br4 118.703
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability