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: BLYP/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 BLYP/6-31G**
 hartrees
Energy at 0K-2611.595661
Energy at 298.15K 
HF Energy-2611.595661
Nuclear repulsion energy87.310982
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 BLYP/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 3024 3001 15.07      
2 A1 1296 1286 28.33      
3 A1 559 555 12.78      
4 E 3135 3111 4.50      
4 E 3135 3111 4.50      
5 E 1452 1441 4.36      
5 E 1452 1441 4.37      
6 E 932 925 5.54      
6 E 932 925 5.54      

Unscaled Zero Point Vibrational Energy (zpe) 7959.0 cm-1
Scaled (by 0.9923) Zero Point Vibrational Energy (zpe) 7897.7 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 BLYP/6-31G**
ABC
5.11583 0.30531 0.30531

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.560
Br2 0.000 0.000 0.429
H3 0.000 1.044 -1.888
H4 0.904 -0.522 -1.888
H5 -0.904 -0.522 -1.888

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.98921.09431.09431.0943
Br21.98922.54152.54152.5415
H31.09432.54151.80821.8082
H41.09432.54151.80821.8082
H51.09432.54151.80821.8082

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 107.446 Br2 C1 H4 107.446
Br2 C1 H5 107.446 H3 C1 H4 111.418
H3 C1 H5 111.418 H4 C1 H5 111.418
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at BLYP/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.308      
2 Br -0.137      
3 H 0.148      
4 H 0.148      
5 H 0.148      


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 -1.894 1.894
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.528 0.000 0.000
y 0.000 -25.528 0.000
z 0.000 0.000 -21.587
Traceless
 xyz
x -1.970 0.000 0.000
y 0.000 -1.970 0.000
z 0.000 0.000 3.941
Polar
3z2-r27.882
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 3.325 0.000 0.000
y 0.000 3.325 0.000
z 0.000 0.000 5.497


<r2> (average value of r2) Å2
<r2> 50.136
(<r2>)1/2 7.081