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

using model chemistry: LSDA/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 LSDA/3-21G*
 hartrees
Energy at 0K-2598.687702
Energy at 298.15K 
HF Energy-2598.687702
Nuclear repulsion energy89.354616
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 LSDA/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 3021 2966 9.42      
2 A1 1332 1308 4.04      
3 A1 646 634 6.96      
4 E 3128 3072 0.98      
4 E 3128 3072 0.98      
5 E 1476 1449 13.56      
5 E 1476 1449 13.56      
6 E 951 933 12.53      
6 E 951 933 12.53      

Unscaled Zero Point Vibrational Energy (zpe) 8053.1 cm-1
Scaled (by 0.982) Zero Point Vibrational Energy (zpe) 7908.2 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 LSDA/3-21G*
ABC
5.12967 0.32200 0.32200

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

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.510
Br2 0.000 0.000 0.418
H3 0.000 1.043 -1.858
H4 0.903 -0.521 -1.858
H5 -0.903 -0.521 -1.858

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.92861.09911.09911.0991
Br21.92862.50402.50402.5040
H31.09912.50401.80581.8058
H41.09912.50401.80581.8058
H51.09912.50401.80581.8058

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 108.458 Br2 C1 H4 108.458
Br2 C1 H5 108.458 H3 C1 H4 110.465
H3 C1 H5 110.465 H4 C1 H5 110.465
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at LSDA/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.709      
2 Br -0.070      
3 H 0.260      
4 H 0.260      
5 H 0.260      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 -1.727 1.727
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.243 0.000 0.000
y 0.000 -25.243 0.000
z 0.000 0.000 -21.457
Traceless
 xyz
x -1.893 0.000 0.000
y 0.000 -1.893 0.000
z 0.000 0.000 3.787
Polar
3z2-r27.573
x2-y20.000
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.892 0.000 0.000
y 0.000 2.892 0.000
z 0.000 0.000 4.866


<r2> (average value of r2) Å2
<r2> 48.410
(<r2>)1/2 6.958