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All results from a given calculation for HCCBr (bromoacetylene)

using model chemistry: HF/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 HF/3-21G*
 hartrees
Energy at 0K-2636.077519
Energy at 298.15K-2636.080287
HF Energy-2636.077519
Nuclear repulsion energy124.033363
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 HF/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 3667 3310 91.87      
2 Σ 2379 2148 6.87      
3 Σ 636 574 0.07      
4 Π 941 850 57.51      
4 Π 941 850 57.51      
5 Π 397 358 12.73      
5 Π 397 358 12.73      

Unscaled Zero Point Vibrational Energy (zpe) 4679.5 cm-1
Scaled (by 0.9026) Zero Point Vibrational Energy (zpe) 4223.7 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 HF/3-21G*
B
0.13386

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -2.304
C2 0.000 0.000 -1.117
Br3 0.000 0.000 0.682
H4 0.000 0.000 -3.354

Atom - Atom Distances (Å)
  C1 C2 Br3 H4
C11.18672.98661.0503
C21.18671.79992.2370
Br32.98661.79994.0369
H41.05032.23704.0369

picture of bromoacetylene state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 Br3 180.000 C2 C1 H4 180.000
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.290      
2 C -0.139      
3 Br 0.080      
4 H 0.349      


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 -0.408 0.408
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -30.799 0.000 0.000
y 0.000 -30.799 0.000
z 0.000 0.000 -21.534
Traceless
 xyz
x -4.633 0.000 0.000
y 0.000 -4.633 0.000
z 0.000 0.000 9.265
Polar
3z2-r218.530
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 2.124 0.000 0.000
y 0.000 2.124 0.000
z 0.000 0.000 7.885


<r2> (average value of r2) Å2
<r2> 84.207
(<r2>)1/2 9.176