return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
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All results from a given calculation for CH3Br (methyl bromide)

using model chemistry: B2PLYP=FULL/6-31+G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at B2PLYP=FULL/6-31+G**
 hartrees
Energy at 0K-2611.108525
Energy at 298.15K 
HF Energy-2611.011347
Nuclear repulsion energy88.649288
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 B2PLYP=FULL/6-31+G**
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A 3247 3088 1.87      
2 A 3247 3088 1.87      
3 A 3130 2977 18.06      
4 A 1505 1431 5.84      
4 A 1505 1431 5.85      
5 A 1372 1304 29.44      
5 A 992 944 5.09      
6 A 992 944 5.09      
6 A 606 576 13.26      

Unscaled Zero Point Vibrational Energy (zpe) 8298.0 cm-1
Scaled (by 0.951) Zero Point Vibrational Energy (zpe) 7891.4 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 B2PLYP=FULL/6-31+G**
ABC
5.22262 0.31527 0.31527

See section I.F.4 to change rotational constant units
Geometric Data calculated at B2PLYP=FULL/6-31+G**

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.533 0.000 -0.000
Br2 -0.423 0.000 0.000
H3 1.864 -0.032 1.033
H4 1.864 -0.878 -0.544
H5 1.864 0.911 -0.488

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.95521.08501.08501.0850
Br21.95522.50892.50902.5090
H31.08502.50891.78961.7896
H41.08502.50901.78961.7897
H51.08502.50901.78961.7897

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 107.769 Br2 C1 H4 107.772
Br2 C1 H5 107.771 H3 C1 H4 111.115
H3 C1 H5 111.115 H4 C1 H5 111.120
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability