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

using model chemistry: LSDA/6-31+G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at LSDA/6-31+G**
 hartrees
Energy at 0K-2608.610560
Energy at 298.15K 
HF Energy-2608.610560
Nuclear repulsion energy89.559837
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 LSDA/6-31+G**
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 3025 2979 11.75      
2 A1 1290 1270 11.61      
3 A1 627 617 7.93      
4 E 3141 3094 0.09      
4 E 3141 3094 0.09      
5 E 1411 1390 9.80      
5 E 1411 1390 9.80      
6 E 943 929 8.41      
6 E 943 929 8.41      

Unscaled Zero Point Vibrational Energy (zpe) 7965.8 cm-1
Scaled (by 0.985) Zero Point Vibrational Energy (zpe) 7846.3 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 LSDA/6-31+G**
ABC
5.14305 0.32356 0.32356

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.507
Br2 0.000 0.000 0.417
H3 0.000 1.041 -1.854
H4 0.902 -0.521 -1.854
H5 -0.902 -0.521 -1.854

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.92401.09751.09751.0975
Br21.92402.49822.49822.4982
H31.09752.49821.80341.8034
H41.09752.49821.80341.8034
H51.09752.49821.80341.8034

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 108.430 Br2 C1 H4 108.430
Br2 C1 H5 108.430 H3 C1 H4 110.492
H3 C1 H5 110.492 H4 C1 H5 110.492
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at LSDA/6-31+G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.519      
2 Br -0.141      
3 H 0.220      
4 H 0.220      
5 H 0.220      


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 -1.985 1.985
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -26.079 0.000 0.000
y 0.000 -26.079 0.000
z 0.000 0.000 -22.159
Traceless
 xyz
x -1.960 0.000 0.000
y 0.000 -1.960 0.000
z 0.000 0.000 3.920
Polar
3z2-r27.841
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 3.903 0.000 0.000
y 0.000 3.903 0.000
z 0.000 0.000 5.785


<r2> (average value of r2) Å2
<r2> 48.748
(<r2>)1/2 6.982