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 HBr (hydrogen bromide)

using model chemistry: B3PW91/3-21G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C*V 1Σ
Energy calculated at B3PW91/3-21G*
 hartrees
Energy at 0K-2562.617932
Energy at 298.15K-2562.620909
HF Energy-2562.617932
Nuclear repulsion energy12.942971
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 B3PW91/3-21G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Σ 2635 2528 2.17      

Unscaled Zero Point Vibrational Energy (zpe) 1317.4 cm-1
Scaled (by 0.9594) Zero Point Vibrational Energy (zpe) 1263.9 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 B3PW91/3-21G*
B
8.27279

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/3-21G*

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
H1 0.000 0.000 -1.391
Br2 0.000 0.000 0.040

Atom - Atom Distances (Å)
  H1 Br2
H11.4310
Br21.4310

picture of hydrogen bromide state 1 conformation 1
More geometry information
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 H 0.224      
2 Br -0.224      


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 -1.032 1.032
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.353 0.000 0.000
y 0.000 -19.353 0.000
z 0.000 0.000 -15.200
Traceless
 xyz
x -2.077 0.000 0.000
y 0.000 -2.077 0.000
z 0.000 0.000 4.154
Polar
3z2-r28.307
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 1.549 0.000 0.000
y 0.000 1.549 0.000
z 0.000 0.000 2.682


<r2> (average value of r2) Å2
<r2> 13.214
(<r2>)1/2 3.635