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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-2611.766248
Energy at 298.15K 
HF Energy-2611.766248
Nuclear repulsion energy89.180471
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 3121 2970 15.40      
2 A1 1352 1287 20.48      
3 A1 622 592 12.38      
4 E 3242 3085 1.97      
4 E 3242 3085 1.97      
5 E 1493 1420 6.29      
5 E 1493 1420 6.29      
6 E 978 930 6.43      
6 E 978 930 6.43      

Unscaled Zero Point Vibrational Energy (zpe) 8260.3 cm-1
Scaled (by 0.9515) Zero Point Vibrational Energy (zpe) 7859.6 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
5.21718 0.31968 0.31968

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 -1.520
Br2 0.000 0.000 0.420
H3 0.000 1.034 -1.855
H4 0.895 -0.517 -1.855
H5 -0.895 -0.517 -1.855

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.93991.08651.08651.0865
Br21.93992.49822.49822.4982
H31.08652.49821.79061.7906
H41.08652.49821.79061.7906
H51.08652.49821.79061.7906

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 107.923 Br2 C1 H4 107.923
Br2 C1 H5 107.923 H3 C1 H4 110.975
H3 C1 H5 110.975 H4 C1 H5 110.975
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 -0.415      
2 Br -0.139      
3 H 0.185      
4 H 0.185      
5 H 0.185      


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 -1.944 1.944
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.409 0.000 0.000
y 0.000 -25.409 0.000
z 0.000 0.000 -21.515
Traceless
 xyz
x -1.947 0.000 0.000
y 0.000 -1.947 0.000
z 0.000 0.000 3.894
Polar
3z2-r27.788
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 3.278 0.000 0.000
y 0.000 3.278 0.000
z 0.000 0.000 5.287


<r2> (average value of r2) Å2
<r2> 48.614
(<r2>)1/2 6.972