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

using model chemistry: MP2/CEP-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 MP2/CEP-31G
 hartrees
Energy at 0K-20.458632
Energy at 298.15K 
HF Energy-20.346694
Nuclear repulsion energy18.268151
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 MP2/CEP-31G
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 3083 2979 42.91      
2 A1 1388 1341 29.54      
3 A1 576 557 10.66      
4 E 3225 3117 24.01      
4 E 3225 3117 24.01      
5 E 1482 1432 6.21      
5 E 1482 1432 6.21      
6 E 977 944 9.98      
6 E 977 944 9.98      

Unscaled Zero Point Vibrational Energy (zpe) 8207.6 cm-1
Scaled (by 0.9663) Zero Point Vibrational Energy (zpe) 7931.0 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 MP2/CEP-31G
ABC
5.04432 0.29598 0.29598

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.584
Br2 0.000 0.000 0.436
H3 0.000 1.051 -1.920
H4 0.910 -0.526 -1.920
H5 -0.910 -0.526 -1.920

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C12.02031.10351.10351.1035
Br22.02032.57962.57962.5796
H31.10352.57961.82101.8210
H41.10352.57961.82101.8210
H51.10352.57961.82101.8210

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 107.690 Br2 C1 H4 107.690
Br2 C1 H5 107.690 H3 C1 H4 111.192
H3 C1 H5 111.192 H4 C1 H5 111.192
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability