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All results from a given calculation for CH3Br (methyl bromide)

using model chemistry: MP2=FULL/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at MP2=FULL/6-31G*
 hartrees
Energy at 0K-2609.776719
Energy at 298.15K 
HF Energy-2609.500457
Nuclear repulsion energy88.881355
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=FULL/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
1 A1 3160 2977 13.43      
2 A1 1401 1320 22.73      
3 A1 631 595 11.88      
4 E 3283 3093 1.55      
4 E 3283 3093 1.55      
5 E 1543 1454 5.50      
5 E 1543 1454 5.50      
6 E 1005 947 5.86      
6 E 1005 947 5.86      

Unscaled Zero Point Vibrational Energy (zpe) 8427.6 cm-1
Scaled (by 0.9422) Zero Point Vibrational Energy (zpe) 7940.5 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 MP2=FULL/6-31G*
ABC
5.20943 0.31728 0.31728

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-31G*

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.527
Br2 0.000 0.000 0.421
H3 0.000 1.035 -1.860
H4 0.896 -0.517 -1.860
H5 -0.896 -0.517 -1.860

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.94811.08671.08671.0867
Br21.94812.50442.50442.5044
H31.08672.50441.79191.7919
H41.08672.50441.79191.7919
H51.08672.50441.79191.7919

picture of methyl bromide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
Br2 C1 H3 107.822 Br2 C1 H4 107.822
Br2 C1 H5 107.822 H3 C1 H4 111.069
H3 C1 H5 111.069 H4 C1 H5 111.069
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability