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All results from a given calculation for HCCBr (bromoacetylene)

using model chemistry: MP2/STO-3G

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 MP2/STO-3G
 hartrees
Energy at 0K-2620.111683
Energy at 298.15K-2620.113982
HF Energy-2619.947524
Nuclear repulsion energy121.751307
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 MP2/STO-3G
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 3731 3253 124.21      
2 Σ 2244 1957 0.60      
3 Σ 634 552 0.90      
4 Π 728 635 11.99      
4 Π 728 635 11.99      
5 Π 321 280 0.22      
5 Π 321 280 0.22      

Unscaled Zero Point Vibrational Energy (zpe) 4353.6 cm-1
Scaled (by 0.8719) Zero Point Vibrational Energy (zpe) 3795.9 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 MP2/STO-3G
B
0.12886

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/STO-3G

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -2.352
C2 0.000 0.000 -1.130
Br3 0.000 0.000 0.695
H4 0.000 0.000 -3.433

Atom - Atom Distances (Å)
  C1 C2 Br3 H4
C11.22203.04711.0807
C21.22201.82512.3027
Br33.04711.82514.1278
H41.08072.30274.1278

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