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

using model chemistry: ROMP2/cc-pVDZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at ROMP2/cc-pVDZ
 hartrees
Energy at 0K-2612.279745
Energy at 298.15K 
HF Energy-2612.000288
Nuclear repulsion energy89.012254
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 ROMP2/cc-pVDZ
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 3123 3123        
2 A1 1345 1345        
3 A1 646 646        
4 E 3252 3252        
4 E 3251 3251        
5 E 1479 1479        
5 E 1479 1479        
6 E 977 977        
6 E 977 977        

Unscaled Zero Point Vibrational Energy (zpe) 8264.7 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 8264.7 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 ROMP2/cc-pVDZ
ABC
5.13265 0.31913 0.31913

See section I.F.4 to change rotational constant units
Geometric Data calculated at ROMP2/cc-pVDZ

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.519
Br2 0.000 0.000 0.420
H3 0.000 1.042 -1.863
H4 0.903 -0.521 -1.863
H5 -0.903 -0.521 -1.863

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.93891.09751.09751.0975
Br21.93892.50952.50952.5095
H31.09752.50951.80521.8052
H41.09752.50951.80521.8052
H51.09752.50951.80521.8052

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 108.264 Br2 C1 H4 108.264
Br2 C1 H5 108.264 H3 C1 H4 110.651
H3 C1 H5 110.651 H4 C1 H5 110.651
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at ROMP2/cc-pVDZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.124      
2 Br -0.155      
3 H 0.093      
4 H 0.093      
5 H 0.093      


Electric dipole moments


Electric Quadrupole moment
Quadrupole components in D Å


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> 49.015
(<r2>)1/2 7.001