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

using model chemistry: QCISD/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 QCISD/6-31G*
 hartrees
Energy at 0K-2609.771259
Energy at 298.15K-2609.777057
HF Energy-2609.500239
Nuclear repulsion energy88.343581
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 QCISD/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 3125 2976 16.10      
2 A1 1383 1317 24.35      
3 A1 610 581 12.50      
4 E 3238 3084 3.50      
4 E 3238 3084 3.50      
5 E 1526 1454 5.08      
5 E 1526 1454 5.08      
6 E 992 944 5.10      
6 E 992 944 5.10      

Unscaled Zero Point Vibrational Energy (zpe) 8315.4 cm-1
Scaled (by 0.9523) Zero Point Vibrational Energy (zpe) 7918.8 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 QCISD/6-31G*
ABC
5.17372 0.31318 0.31318

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.531
Br2 0.000 0.000 0.421
H3 0.000 1.042 -1.852
H4 0.902 -0.521 -1.852
H5 -0.902 -0.521 -1.852

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.95211.09001.09001.0900
Br21.95212.50082.50082.5008
H31.09002.50081.80401.8040
H41.09002.50081.80401.8040
H51.09002.50081.80401.8040

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 107.154 Br2 C1 H4 107.154
Br2 C1 H5 107.154 H3 C1 H4 111.686
H3 C1 H5 111.686 H4 C1 H5 111.686
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability