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

using model chemistry: ROMP2/cc-pVTZ

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/cc-pVTZ
 hartrees
Energy at 0K-2612.501228
Energy at 298.15K 
HF Energy-2612.092252
Nuclear repulsion energy89.748855
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/cc-pVTZ
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 3121 3121        
2 A1 1351 1351        
3 A1 653 653        
4 E 3238 3238        
4 E 3237 3237        
5 E 1495 1495        
5 E 1494 1494        
6 E 980 980        
6 E 980 980        

Unscaled Zero Point Vibrational Energy (zpe) 8274.7 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 8274.7 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/cc-pVTZ
ABC
5.26930 0.32397 0.32397

See section I.F.4 to change rotational constant units
Geometric Data calculated at ROMP2/cc-pVTZ

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.509
Br2 0.000 0.000 0.417
H3 0.000 1.029 -1.847
H4 0.891 -0.514 -1.847
H5 -0.891 -0.514 -1.847

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.92561.08271.08271.0827
Br21.92562.48622.48622.4862
H31.08272.48621.78171.7817
H41.08272.48621.78171.7817
H51.08272.48621.78171.7817

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 108.180 Br2 C1 H4 108.180
Br2 C1 H5 108.180 H3 C1 H4 110.731
H3 C1 H5 110.731 H4 C1 H5 110.731
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at ROMP2/cc-pVTZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.197      
2 Br -0.165      
3 H 0.121      
4 H 0.121      
5 H 0.121      


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> 48.583
(<r2>)1/2 6.970