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All results from a given calculation for HCCBr (bromoacetylene)

using model chemistry: QCISD/6-31+G**

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 QCISD/6-31+G**
 hartrees
Energy at 0K-2646.532211
Energy at 298.15K-2646.534863
HF Energy-2646.143421
Nuclear repulsion energy123.184828
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 QCISD/6-31+G**
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 3524 3331 76.71      
2 Σ 2178 2059 15.27      
3 Σ 600 568 0.89      
4 Π 662 626 49.51      
4 Π 662 626 49.51      
5 Π 448 424 9.73      
5 Π 448 424 9.73      

Unscaled Zero Point Vibrational Energy (zpe) 4261.2 cm-1
Scaled (by 0.9454) Zero Point Vibrational Energy (zpe) 4028.6 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 QCISD/6-31+G**
B
0.13183

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/6-31+G**

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -2.328
C2 0.000 0.000 -1.114
Br3 0.000 0.000 0.687
H4 0.000 0.000 -3.391

Atom - Atom Distances (Å)
  C1 C2 Br3 H4
C11.21353.01451.0637
C21.21351.80102.2772
Br33.01451.80104.0783
H41.06372.27724.0783

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