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

using model chemistry: PBEPBEultrafine/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 PBEPBEultrafine/6-31G*
 hartrees
Energy at 0K-2611.145416
Energy at 298.15K 
HF Energy-2611.145416
Nuclear repulsion energy88.294406
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 PBEPBEultrafine/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 3037 2987 14.58      
2 A1 1310 1288 20.45      
3 A1 596 586 10.91      
4 E 3149 3097 2.90      
4 E 3149 3097 2.90      
5 E 1459 1434 6.08      
5 E 1459 1434 6.08      
6 E 944 928 6.90      
6 E 944 928 6.90      

Unscaled Zero Point Vibrational Energy (zpe) 8022.6 cm-1
Scaled (by 0.9835) Zero Point Vibrational Energy (zpe) 7890.2 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 PBEPBEultrafine/6-31G*
ABC
5.11712 0.31332 0.31332

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.536
Br2 0.000 0.000 0.424
H3 0.000 1.044 -1.873
H4 0.904 -0.522 -1.873
H5 -0.904 -0.522 -1.873

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.95971.09681.09681.0968
Br21.95972.52252.52252.5225
H31.09682.52251.80801.8080
H41.09682.52251.80801.8080
H51.09682.52251.80801.8080

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 107.877 Br2 C1 H4 107.877
Br2 C1 H5 107.877 H3 C1 H4 111.018
H3 C1 H5 111.018 H4 C1 H5 111.018
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBEultrafine/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.513      
2 Br -0.120      
3 H 0.211      
4 H 0.211      
5 H 0.211      


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 -1.869 1.869
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.470 0.000 0.000
y 0.000 -25.470 0.000
z 0.000 0.000 -21.597
Traceless
 xyz
x -1.937 0.000 0.000
y 0.000 -1.937 0.000
z 0.000 0.000 3.873
Polar
3z2-r27.747
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 3.306 0.000 0.000
y 0.000 3.306 0.000
z 0.000 0.000 5.339


<r2> (average value of r2) Å2
<r2> 49.332
(<r2>)1/2 7.024