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

using model chemistry: mPW1PW91/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at mPW1PW91/6-31G*
 hartrees
Energy at 0K-2611.761955
Energy at 298.15K 
HF Energy-2611.761955
Nuclear repulsion energy89.130400
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 mPW1PW91/6-31G*
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 3131 2969 15.98      
2 A1 1367 1297 21.33      
3 A1 622 590 12.65      
4 E 3247 3080 2.29      
4 E 3247 3080 2.29      
5 E 1511 1433 6.51      
5 E 1511 1433 6.51      
6 E 983 932 6.68      
6 E 983 932 6.68      

Unscaled Zero Point Vibrational Energy (zpe) 8301.5 cm-1
Scaled (by 0.9483) Zero Point Vibrational Energy (zpe) 7872.3 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 mPW1PW91/6-31G*
ABC
5.21225 0.31933 0.31933

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/6-31G*

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.521
Br2 0.000 0.000 0.420
H3 0.000 1.034 -1.856
H4 0.896 -0.517 -1.856
H5 -0.896 -0.517 -1.856

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.94081.08731.08731.0873
Br21.94082.50012.50012.5001
H31.08732.50011.79141.7914
H41.08732.50011.79141.7914
H51.08732.50011.79141.7914

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 107.962 Br2 C1 H4 107.962
Br2 C1 H5 107.962 H3 C1 H4 110.938
H3 C1 H5 110.938 H4 C1 H5 110.938
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.539      
2 Br -0.131      
3 H 0.224      
4 H 0.224      
5 H 0.224      


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 -1.942 1.942
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.416 0.000 0.000
y 0.000 -25.416 0.000
z 0.000 0.000 -21.525
Traceless
 xyz
x -1.945 0.000 0.000
y 0.000 -1.945 0.000
z 0.000 0.000 3.891
Polar
3z2-r27.781
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 3.247 0.000 0.000
y 0.000 3.247 0.000
z 0.000 0.000 5.241


<r2> (average value of r2) Å2
<r2> 48.659
(<r2>)1/2 6.976