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All results from a given calculation for HCCBr (bromoacetylene)

using model chemistry: CBS-Q

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 CBS-Q
 hartrees
Energy at 0K-2649.456952
Energy at 298.15K-2649.452633
HF Energy-2646.202435
Nuclear repulsion energy124.583928
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 CBS-Q
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 3654 3654 86.02      
2 Σ 2387 2387 11.25      
3 Σ 647 647 0.47      
4 Π 842 842 39.87      
4 Π 842 842 39.87      
5 Π 404 404 8.98      
5 Π 404 404 8.98      

Unscaled Zero Point Vibrational Energy (zpe) 4590.0 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 4590.0 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 CBS-Q
B
0.13286

See section I.F.4 to change rotational constant units
Geometric Data calculated at CBS-Q

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -2.295
C2 0.000 0.000 -1.108
Br3 0.000 0.000 0.679
H4 0.000 0.000 -3.355

Atom - Atom Distances (Å)
  C1 C2 Br3 H4
C11.18722.97411.0596
C21.18721.78692.2468
Br32.97411.78694.0337
H41.05962.24684.0337

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