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All results from a given calculation for HCCBr (bromoacetylene)

using model chemistry: QCISD/6-31G*

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/6-31G*
 hartrees
Energy at 0K-2646.496830
Energy at 298.15K-2646.499288
HF Energy-2646.114841
Nuclear repulsion energy123.105308
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/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 Σ 3498 3331 69.13      
2 Σ 2190 2085 7.91      
3 Σ 596 568 0.85      
4 Π 657 625 42.73      
4 Π 657 625 42.73      
5 Π 358 341 5.45      
5 Π 358 341 5.45      

Unscaled Zero Point Vibrational Energy (zpe) 4156.1 cm-1
Scaled (by 0.9523) Zero Point Vibrational Energy (zpe) 3957.8 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/6-31G*
B
0.13170

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

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 -1.116
Br3 0.000 0.000 0.687
H4 0.000 0.000 -3.396

Atom - Atom Distances (Å)
  C1 C2 Br3 H4
C11.21173.01501.0685
C21.21171.80332.2801
Br33.01501.80334.0834
H41.06852.28014.0834

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