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 CH3Br (methyl bromide)

using model chemistry: ROMP2/6-31+G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at ROMP2/6-31+G**
 hartrees
Energy at 0K-2609.783914
Energy at 298.15K 
HF Energy-2609.519684
Nuclear repulsion energy88.960088
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 ROMP2/6-31+G**
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 3168 3168        
2 A1 1397 1397        
3 A1 631 631        
4 E 3295 3295        
4 E 3295 3295        
5 E 1524 1524        
5 E 1524 1524        
6 E 1007 1007        
6 E 1007 1007        

Unscaled Zero Point Vibrational Energy (zpe) 8424.5 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 8424.5 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 ROMP2/6-31+G**
ABC
5.24359 0.31766 0.31766

See section I.F.4 to change rotational constant units
Geometric Data calculated at ROMP2/6-31+G**

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.526
Br2 0.000 0.000 0.421
H3 0.000 1.031 -1.859
H4 0.893 -0.516 -1.859
H5 -0.893 -0.516 -1.859

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.94691.08381.08381.0838
Br21.94692.50272.50272.5027
H31.08382.50271.78601.7860
H41.08382.50271.78601.7860
H51.08382.50271.78601.7860

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 107.922 Br2 C1 H4 107.922
Br2 C1 H5 107.922 H3 C1 H4 110.975
H3 C1 H5 110.975 H4 C1 H5 110.975
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at ROMP2/6-31+G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.265      
2 Br -0.239      
3 H 0.168      
4 H 0.168      
5 H 0.168      


Electric dipole moments


Electric Quadrupole moment
Quadrupole components in D Å


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 0.000 0.000 0.000
y 0.000 0.000 0.000
z 0.000 0.000 0.000


<r2> (average value of r2) Å2
<r2> 49.225
(<r2>)1/2 7.016