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

using model chemistry: MP4=FULL/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at MP4=FULL/3-21G
 hartrees
Energy at 0K-2599.607036
Energy at 298.15K 
HF Energy-2599.448408
Nuclear repulsion energy86.187646
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 MP4=FULL/3-21G
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 3090 3024        
2 A1 1394 1365        
3 A1 576 564        
4 E 3193 3126        
4 E 3193 3125        
5 E 1549 1516        
5 E 1548 1515        
6 E 971 951        
6 E 971 951        

Unscaled Zero Point Vibrational Energy (zpe) 8242.7 cm-1
Scaled (by 0.9788) Zero Point Vibrational Energy (zpe) 8067.9 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 MP4=FULL/3-21G
ABC
5.15058 0.29615 0.29615

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP4=FULL/3-21G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.586
Br2 0.000 0.000 0.436
H3 0.000 1.040 -1.915
H4 0.901 -0.520 -1.915
H5 -0.901 -0.520 -1.915

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C12.02171.09141.09141.0914
Br22.02172.57122.57122.5712
H31.09142.57121.80211.8021
H41.09142.57121.80211.8021
H51.09142.57121.80211.8021

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 107.577 Br2 C1 H4 107.577
Br2 C1 H5 107.577 H3 C1 H4 111.297
H3 C1 H5 111.297 H4 C1 H5 111.297
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability