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

using model chemistry: ROHF/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 ROHF/3-21G
 hartrees
Energy at 0K-2599.449162
Energy at 298.15K 
HF Energy-2599.449162
Nuclear repulsion energy87.262568
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 ROHF/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 3270 2966 19.30      
2 A1 1488 1350 33.91      
3 A1 616 559 24.98      
4 E 3379 3065 2.82      
4 E 3379 3065 2.82      
5 E 1639 1486 11.09      
5 E 1639 1486 11.09      
6 E 1052 954 7.70      
6 E 1052 954 7.70      

Unscaled Zero Point Vibrational Energy (zpe) 8756.6 cm-1
Scaled (by 0.907) Zero Point Vibrational Energy (zpe) 7942.3 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 ROHF/3-21G
ABC
5.29366 0.30339 0.30339

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.568
Br2 0.000 0.000 0.431
H3 0.000 1.026 -1.888
H4 0.889 -0.513 -1.888
H5 -0.889 -0.513 -1.888

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.99881.07511.07511.0751
Br21.99882.53592.53592.5359
H31.07512.53591.77761.7776
H41.07512.53591.77761.7776
H51.07512.53591.77761.7776

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 107.326 Br2 C1 H4 107.326
Br2 C1 H5 107.326 H3 C1 H4 111.528
H3 C1 H5 111.528 H4 C1 H5 111.528
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at ROHF/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.795      
2 Br 0.001      
3 H 0.265      
4 H 0.265      
5 H 0.265      


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 -2.159 2.159
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.806 0.000 0.000
y 0.000 -25.807 -0.001
z 0.000 -0.001 -22.322
Traceless
 xyz
x -1.742 0.000 0.000
y 0.000 -1.743 -0.001
z 0.000 -0.001 3.485
Polar
3z2-r26.970
x2-y20.001
xy0.000
xz0.000
yz-0.001


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


<r2> (average value of r2) Å2
<r2> 50.494
(<r2>)1/2 7.106