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All results from a given calculation for HCCBr (bromoacetylene)

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-2638.293824
Energy at 298.15K-2638.296412
HF Energy-2638.293824
Nuclear repulsion energy123.829255
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 3505 3362 90.12      
2 Σ 2212 2122 19.04      
3 Σ 619 594 1.25      
4 Π 770 738 52.16      
4 Π 770 738 52.16      
5 Π 362 347 10.13      
5 Π 362 347 10.13      

Unscaled Zero Point Vibrational Energy (zpe) 4299.2 cm-1
Scaled (by 0.9594) Zero Point Vibrational Energy (zpe) 4124.6 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
0.13323

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)
C1 0.000 0.000 -2.315
C2 0.000 0.000 -1.108
Br3 0.000 0.000 0.683
H4 0.000 0.000 -3.378

Atom - Atom Distances (Å)
  C1 C2 Br3 H4
C11.20682.99831.0626
C21.20681.79152.2694
Br32.99831.79154.0609
H41.06262.26944.0609

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 B3PW91/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.279      
2 C -0.066      
3 Br 0.056      
4 H 0.289      


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 -0.098 0.098
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -30.270 0.000 0.000
y 0.000 -30.270 0.000
z 0.000 0.000 -21.526
Traceless
 xyz
x -4.372 0.000 0.000
y 0.000 -4.372 0.000
z 0.000 0.000 8.744
Polar
3z2-r217.487
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 2.178 0.000 0.000
y 0.000 2.178 0.000
z 0.000 0.000 8.264


<r2> (average value of r2) Å2
<r2> 84.357
(<r2>)1/2 9.185