return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

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

using model chemistry: mPW1PW91/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3V 1A1
Energy calculated at mPW1PW91/3-21G*
 hartrees
Energy at 0K-2601.886544
Energy at 298.15K 
HF Energy-2601.886544
Nuclear repulsion energy88.901187
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 mPW1PW91/3-21G*
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 3115 2958 13.61      
2 A1 1395 1325 9.96      
3 A1 638 606 9.72      
4 E 3222 3059 2.57      
4 E 3222 3059 2.57      
5 E 1543 1465 10.55      
5 E 1543 1465 10.55      
6 E 992 942 10.12      
6 E 992 942 10.12      

Unscaled Zero Point Vibrational Energy (zpe) 8330.4 cm-1
Scaled (by 0.9496) Zero Point Vibrational Energy (zpe) 7910.5 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 mPW1PW91/3-21G*
ABC
5.20879 0.31754 0.31754

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/3-21G*

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.525
Br2 0.000 0.000 0.421
H3 0.000 1.035 -1.863
H4 0.896 -0.517 -1.863
H5 -0.896 -0.517 -1.863

Atom - Atom Distances (Å)
  C1 Br2 H3 H4 H5
C11.94591.08861.08861.0886
Br21.94592.50782.50782.5078
H31.08862.50781.79201.7920
H41.08862.50781.79201.7920
H51.08862.50781.79201.7920

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 108.118 Br2 C1 H4 108.118
Br2 C1 H5 108.118 H3 C1 H4 110.790
H3 C1 H5 110.790 H4 C1 H5 110.790
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at mPW1PW91/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.699      
2 Br -0.079      
3 H 0.259      
4 H 0.259      
5 H 0.259      


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 -1.803 1.803
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -25.312 0.000 0.000
y 0.000 -25.312 0.000
z 0.000 0.000 -21.400
Traceless
 xyz
x -1.956 0.000 0.000
y 0.000 -1.956 0.000
z 0.000 0.000 3.912
Polar
3z2-r27.824
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 2.864 0.000 0.000
y 0.000 2.864 0.000
z 0.000 0.000 4.957


<r2> (average value of r2) Å2
<r2> 48.778
(<r2>)1/2 6.984