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

using model chemistry: HF/LANL2DZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at HF/LANL2DZ
 hartrees
Energy at 0K-52.523608
Energy at 298.15K 
HF Energy-52.523608
Nuclear repulsion energy25.161071
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 HF/LANL2DZ
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 3282 2954 37.17 173.56 0.01 0.01
2 A1 1478 1330 41.93 2.75 0.49 0.66
3 A1 579 521 25.62 55.84 0.36 0.53
4 E 3421 3079 14.69 68.95 0.75 0.86
4 E 3421 3079 14.69 68.95 0.75 0.86
5 E 1617 1456 7.21 18.17 0.75 0.86
5 E 1617 1456 7.21 18.17 0.75 0.86
6 E 1058 952 11.24 13.47 0.75 0.86
6 E 1058 952 11.24 13.47 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 8766.2 cm-1
Scaled (by 0.8999) Zero Point Vibrational Energy (zpe) 7888.7 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 HF/LANL2DZ
ABC
5.28666 0.29954 0.29954

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/LANL2DZ

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.580
Br2 0.000 0.000 0.433
H3 0.000 1.027 -1.896
H4 0.889 -0.513 -1.896
H5 -0.889 -0.513 -1.896

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C12.01331.07461.07461.0746
Br22.01332.54592.54592.5459
H31.07462.54591.77881.7788
H41.07462.54591.77881.7788
H51.07462.54591.77881.7788

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 107.119 Br2 C1 H4 107.119
Br2 C1 H5 107.119 H3 C1 H4 111.718
H3 C1 H5 111.718 H4 C1 H5 111.718
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/LANL2DZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.654      
2 Br -0.079      
3 H 0.245      
4 H 0.245      
5 H 0.245      


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 -2.646 2.646
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.852 0.000 0.000
y 0.000 -22.852 0.000
z 0.000 0.000 -18.826
Traceless
 xyz
x -2.013 0.000 0.000
y 0.000 -2.013 0.000
z 0.000 0.000 4.026
Polar
3z2-r28.051
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 1.714 0.000 0.000
y 0.000 1.714 0.000
z 0.000 0.000 5.684


<r2> (average value of r2) Å2
<r2> 43.677
(<r2>)1/2 6.609