return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

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

using model chemistry: TPSSh/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at TPSSh/6-31G(2df,p)
 hartrees
Energy at 0K-2611.668135
Energy at 298.15K 
HF Energy-2611.668135
Nuclear repulsion energy89.538532
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 TPSSh/6-31G(2df,p)
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 3080 2972 16.90 106.52 0.00 0.00
2 A1 1340 1293 20.76 0.43 0.75 0.86
3 A1 628 606 11.31 15.51 0.19 0.32
4 E 3187 3076 3.50 57.23 0.75 0.86
4 E 3187 3076 3.50 57.23 0.75 0.86
5 E 1491 1439 4.07 9.65 0.75 0.86
5 E 1491 1439 4.07 9.65 0.75 0.86
6 E 972 938 3.89 2.89 0.75 0.86
6 E 972 938 3.89 2.89 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 8174.4 cm-1
Scaled (by 0.965) Zero Point Vibrational Energy (zpe) 7888.3 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 TPSSh/6-31G(2df,p)
ABC
5.21500 0.32271 0.32271

See section I.F.4 to change rotational constant units
Geometric Data calculated at TPSSh/6-31G(2df,p)

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.511
Br2 0.000 0.000 0.418
H3 0.000 1.034 -1.851
H4 0.895 -0.517 -1.851
H5 -0.895 -0.517 -1.851

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.92881.08841.08841.0884
Br21.92882.49322.49322.4932
H31.08842.49321.79091.7909
H41.08842.49321.79091.7909
H51.08842.49321.79091.7909

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 108.193 Br2 C1 H4 108.193
Br2 C1 H5 108.193 H3 C1 H4 110.719
H3 C1 H5 110.719 H4 C1 H5 110.719
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at TPSSh/6-31G(2df,p) Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.527      
2 Br -0.038      
3 H 0.188      
4 H 0.188      
5 H 0.188      


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


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.043 0.000 0.000
y 0.000 4.043 0.000
z 0.000 0.000 5.844


<r2> (average value of r2) Å2
<r2> 48.363
(<r2>)1/2 6.954