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

using model chemistry: PBEPBE/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 PBEPBE/6-31G
 hartrees
Energy at 0K-2611.003759
Energy at 298.15K 
HF Energy-2611.003759
Nuclear repulsion energy86.636525
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/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 3050 3008 12.66      
2 A1 1329 1310 13.72      
3 A1 555 548 12.76      
4 E 3179 3135 4.85      
4 E 3179 3135 4.85      
5 E 1472 1451 11.73      
5 E 1472 1451 11.73      
6 E 949 936 10.18      
6 E 949 936 10.18      

Unscaled Zero Point Vibrational Energy (zpe) 8066.2 cm-1
Scaled (by 0.9862) Zero Point Vibrational Energy (zpe) 7954.9 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/6-31G
ABC
5.09218 0.30007 0.30007

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.575
Br2 0.000 0.000 0.433
H3 0.000 1.046 -1.900
H4 0.906 -0.523 -1.900
H5 -0.906 -0.523 -1.900

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C12.00841.09551.09551.0955
Br22.00842.55662.55662.5566
H31.09552.55661.81241.8124
H41.09552.55661.81241.8124
H51.09552.55661.81241.8124

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 107.216 Br2 C1 H4 107.216
Br2 C1 H5 107.216 H3 C1 H4 111.629
H3 C1 H5 111.629 H4 C1 H5 111.629
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/6-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.659      
2 Br -0.006      
3 H 0.222      
4 H 0.222      
5 H 0.222      


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 -2.060 2.060
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.656 0.000 0.000
y 0.000 -25.656 0.000
z 0.000 0.000 -21.976
Traceless
 xyz
x -1.840 0.000 0.000
y 0.000 -1.840 0.000
z 0.000 0.000 3.680
Polar
3z2-r27.359
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 2.165 0.000 0.000
y 0.000 2.165 0.000
z 0.000 0.000 5.205


<r2> (average value of r2) Å2
<r2> 50.821
(<r2>)1/2 7.129