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

using model chemistry: B1B95/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at B1B95/3-21G
 hartrees
Energy at 0K-2601.795488
Energy at 298.15K 
HF Energy-2601.795488
Nuclear repulsion energy87.568458
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 B1B95/3-21G
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 3125 2990 11.57      
2 A1 1386 1326 13.10      
3 A1 606 580 12.11      
4 E 3236 3096 3.45      
4 E 3236 3096 3.45      
5 E 1530 1464 12.71      
5 E 1530 1464 12.71      
6 E 978 936 10.68      
6 E 978 936 10.68      

Unscaled Zero Point Vibrational Energy (zpe) 8302.6 cm-1
Scaled (by 0.9567) Zero Point Vibrational Energy (zpe) 7943.1 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 B1B95/3-21G
ABC
5.20739 0.30669 0.30669

See section I.F.4 to change rotational constant units
Geometric Data calculated at B1B95/3-21G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.556
Br2 0.000 0.000 0.428
H3 0.000 1.035 -1.887
H4 0.896 -0.517 -1.887
H5 -0.896 -0.517 -1.887

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.98421.08651.08651.0865
Br21.98422.53622.53622.5362
H31.08652.53621.79221.7922
H41.08652.53621.79221.7922
H51.08652.53621.79221.7922

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 107.754 Br2 C1 H4 107.754
Br2 C1 H5 107.754 H3 C1 H4 111.132
H3 C1 H5 111.132 H4 C1 H5 111.133
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B1B95/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.833      
2 Br 0.034      
3 H 0.266      
4 H 0.266      
5 H 0.266      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 -1.856 1.856
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.391 0.000 0.000
y 0.000 -25.391 0.000
z 0.000 0.000 -21.987
Traceless
 xyz
x -1.702 0.000 0.000
y 0.000 -1.702 0.000
z 0.000 0.000 3.404
Polar
3z2-r26.808
x2-y20.000
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.994 0.000 0.000
y 0.000 1.994 0.000
z 0.000 0.000 4.969


<r2> (average value of r2) Å2
<r2> 49.991
(<r2>)1/2 7.070