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

using model chemistry: ROMP2/6-31G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at ROMP2/6-31G
 hartrees
Energy at 0K-2609.485600
Energy at 298.15K 
HF Energy-2609.355421
Nuclear repulsion energy86.697847
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 ROMP2/6-31G
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 3132 3132        
2 A1 1411 1411        
3 A1 570 570        
4 E 3258 3258        
4 E 3257 3257        
5 E 1546 1546        
5 E 1546 1546        
6 E 993 993        
6 E 993 993        

Unscaled Zero Point Vibrational Energy (zpe) 8352.8 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 8352.8 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 ROMP2/6-31G
ABC
5.15588 0.30010 0.30010

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.575
Br2 0.000 0.000 0.433
H3 0.000 1.040 -1.902
H4 0.901 -0.520 -1.902
H5 -0.901 -0.520 -1.902

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C12.00821.08991.08991.0899
Br22.00822.55572.55572.5557
H31.08992.55571.80121.8012
H41.08992.55571.80121.8012
H51.08992.55571.80121.8012

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 107.425 Br2 C1 H4 107.424
Br2 C1 H5 107.424 H3 C1 H4 111.438
H3 C1 H5 111.438 H4 C1 H5 111.438
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at ROMP2/6-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.632      
2 Br -0.041      
3 H 0.224      
4 H 0.224      
5 H 0.224      


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> 50.983
(<r2>)1/2 7.140