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All results from a given calculation for HCCBr (bromoacetylene)

using model chemistry: QCISD/TZVP

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/TZVP
 hartrees
Energy at 0K-2649.162692
Energy at 298.15K-2649.164784
HF Energy-2648.664375
Nuclear repulsion energy123.119680
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/TZVP
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 3509 3352 77.21      
2 Σ 2173 2076 13.48      
3 Σ 590 564 0.68      
4 Π 573 547 50.42      
4 Π 573 547 50.42      
5 Π 240 229 2.39      
5 Π 240 229 2.39      

Unscaled Zero Point Vibrational Energy (zpe) 3948.3 cm-1
Scaled (by 0.9553) Zero Point Vibrational Energy (zpe) 3771.8 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/TZVP
B
0.13179

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/TZVP

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -2.325
C2 0.000 0.000 -1.120
Br3 0.000 0.000 0.687
H4 0.000 0.000 -3.387

Atom - Atom Distances (Å)
  C1 C2 Br3 H4
C11.20543.01261.0622
C21.20541.80712.2676
Br33.01261.80714.0748
H41.06222.26764.0748

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