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

using model chemistry: PBEPBE/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 PBEPBE/3-21G
 hartrees
Energy at 0K-2601.016074
Energy at 298.15K 
HF Energy-2601.016074
Nuclear repulsion energy86.826540
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 PBEPBE/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 3037 3009 12.46      
2 A1 1342 1329 13.21      
3 A1 591 586 10.69      
4 E 3146 3117 4.82      
4 E 3146 3117 4.82      
5 E 1488 1475 11.80      
5 E 1488 1475 11.80      
6 E 948 939 11.14      
6 E 948 939 11.14      

Unscaled Zero Point Vibrational Energy (zpe) 8066.3 cm-1
Scaled (by 0.9909) Zero Point Vibrational Energy (zpe) 7992.9 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 PBEPBE/3-21G
ABC
5.10704 0.30161 0.30161

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.569
Br2 0.000 0.000 0.432
H3 0.000 1.045 -1.903
H4 0.905 -0.522 -1.903
H5 -0.905 -0.522 -1.903

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C12.00081.09691.09691.0969
Br22.00082.55782.55782.5578
H31.09692.55781.80981.8098
H41.09692.55781.80981.8098
H51.09692.55781.80981.8098

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 107.721 Br2 C1 H4 107.721
Br2 C1 H5 107.721 H3 C1 H4 111.163
H3 C1 H5 111.163 H4 C1 H5 111.163
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.820      
2 Br 0.035      
3 H 0.262      
4 H 0.262      
5 H 0.262      


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 -1.790 1.790
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.483 0.000 0.000
y 0.000 -25.483 0.000
z 0.000 0.000 -22.007
Traceless
 xyz
x -1.738 0.000 0.000
y 0.000 -1.738 0.000
z 0.000 0.000 3.476
Polar
3z2-r26.952
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 2.033 0.000 0.000
y 0.000 2.033 0.000
z 0.000 0.000 4.990


<r2> (average value of r2) Å2
<r2> 50.626
(<r2>)1/2 7.115