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

using model chemistry: MP2=FULL/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 MP2=FULL/6-31G
 hartrees
Energy at 0K-2609.497443
Energy at 298.15K 
HF Energy-2609.355446
Nuclear repulsion energy86.746910
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=FULL/6-31G
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 3133 2977 17.37      
2 A1 1412 1341 22.61      
3 A1 572 543 10.88      
4 E 3259 3096 5.72      
4 E 3259 3096 5.72      
5 E 1545 1468 7.93      
5 E 1545 1468 7.93      
6 E 993 943 7.40      
6 E 993 943 7.40      

Unscaled Zero Point Vibrational Energy (zpe) 8355.0 cm-1
Scaled (by 0.9501) Zero Point Vibrational Energy (zpe) 7938.1 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=FULL/6-31G
ABC
5.15909 0.30046 0.30046

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/6-31G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.574
Br2 0.000 0.000 0.433
H3 0.000 1.040 -1.901
H4 0.900 -0.520 -1.901
H5 -0.900 -0.520 -1.901

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C12.00691.08971.08971.0897
Br22.00692.55462.55462.5546
H31.08972.55461.80061.8006
H41.08972.55461.80061.8006
H51.08972.55461.80061.8006

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 107.444 Br2 C1 H4 107.444
Br2 C1 H5 107.444 H3 C1 H4 111.420
H3 C1 H5 111.420 H4 C1 H5 111.420
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability