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

using model chemistry: PBE1PBE/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 PBE1PBE/6-31G**
 hartrees
Energy at 0K-2611.229947
Energy at 298.15K 
HF Energy-2611.229947
Nuclear repulsion energy89.210549
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 PBE1PBE/6-31G**
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A1 3124 2978 15.37 107.20 0.00 0.00
2 A1 1365 1301 20.30 1.56 0.62 0.76
3 A1 631 601 12.11 16.61 0.26 0.41
4 E 3240 3088 2.02 59.49 0.75 0.86
4 E 3240 3088 2.02 59.49 0.75 0.86
5 E 1506 1435 6.62 13.90 0.75 0.86
5 E 1506 1435 6.62 13.90 0.75 0.86
6 E 982 936 6.81 5.98 0.75 0.86
6 E 982 936 6.81 5.98 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 8287.4 cm-1
Scaled (by 0.9531) Zero Point Vibrational Energy (zpe) 7898.7 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 PBE1PBE/6-31G**
ABC
5.20251 0.32009 0.32009

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBE1PBE/6-31G**

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.518
Br2 0.000 0.000 0.419
H3 0.000 1.035 -1.856
H4 0.897 -0.518 -1.856
H5 -0.897 -0.518 -1.856

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.93781.08881.08881.0888
Br21.93782.49962.49962.4996
H31.08882.49961.79311.7931
H41.08882.49961.79311.7931
H51.08882.49961.79311.7931

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 108.052 Br2 C1 H4 108.052
Br2 C1 H5 108.052 H3 C1 H4 110.853
H3 C1 H5 110.853 H4 C1 H5 110.853
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBE1PBE/6-31G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.543      
2 Br -0.129      
3 H 0.224      
4 H 0.224      
5 H 0.224      


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 -1.928 1.928
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.460 0.000 0.000
y 0.000 -25.460 0.000
z 0.000 0.000 -21.584
Traceless
 xyz
x -1.938 0.000 0.000
y 0.000 -1.938 0.000
z 0.000 0.000 3.876
Polar
3z2-r27.752
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 3.254 0.000 0.000
y 0.000 3.254 0.000
z 0.000 0.000 5.232


<r2> (average value of r2) Å2
<r2> 48.631
(<r2>)1/2 6.974