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

using model chemistry: B3PW91/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at B3PW91/3-21G
 hartrees
Energy at 0K-2601.470791
Energy at 298.15K 
HF Energy-2601.470791
Nuclear repulsion energy87.311434
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 B3PW91/3-21G
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 3113 2992 12.23      
2 A1 1385 1331 12.97      
3 A1 605 581 11.94      
4 E 3224 3099 3.55      
4 E 3224 3099 3.55      
5 E 1528 1469 12.95      
5 E 1528 1469 12.95      
6 E 979 941 11.06      
6 E 979 941 11.06      

Unscaled Zero Point Vibrational Energy (zpe) 8281.3 cm-1
Scaled (by 0.9612) Zero Point Vibrational Energy (zpe) 7960.0 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 B3PW91/3-21G
ABC
5.18200 0.30483 0.30483

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/3-21G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.561
Br2 0.000 0.000 0.430
H3 0.000 1.037 -1.892
H4 0.898 -0.519 -1.892
H5 -0.898 -0.519 -1.892

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.99051.08891.08891.0889
Br21.99052.54282.54282.5428
H31.08892.54281.79661.7966
H41.08892.54281.79661.7966
H51.08892.54281.79661.7966

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 107.704 Br2 C1 H4 107.704
Br2 C1 H5 107.704 H3 C1 H4 111.179
H3 C1 H5 111.179 H4 C1 H5 111.179
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.844      
2 Br 0.033      
3 H 0.270      
4 H 0.270      
5 H 0.270      


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 -1.874 1.874
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.438 0.000 0.000
y 0.000 -25.438 0.000
z 0.000 0.000 -21.985
Traceless
 xyz
x -1.727 0.000 0.000
y 0.000 -1.727 0.000
z 0.000 0.000 3.453
Polar
3z2-r26.907
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 1.998 0.000 0.000
y 0.000 1.998 0.000
z 0.000 0.000 4.988


<r2> (average value of r2) Å2
<r2> 50.214
(<r2>)1/2 7.086