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All results from a given calculation for HCCBr (bromoacetylene)

using model chemistry: QCISD(T)/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(T)/6-31G*
 hartrees
Energy at 0K-2646.511660
Energy at 298.15K-2646.514029
HF Energy-2646.114054
Nuclear repulsion energy122.861226
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(T)/6-31G*
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 3478 3336        
2 Σ 2148 2061        
3 Σ 589 565        
4 Π 610 585        
4 Π 610 585        
5 Π 342 328        
5 Π 342 328        

Unscaled Zero Point Vibrational Energy (zpe) 4059.3 cm-1
Scaled (by 0.9593) Zero Point Vibrational Energy (zpe) 3894.1 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(T)/6-31G*
B
0.13114

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

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -2.334
C2 0.000 0.000 -1.117
Br3 0.000 0.000 0.689
H4 0.000 0.000 -3.404

Atom - Atom Distances (Å)
  C1 C2 Br3 H4
C11.21713.02231.0699
C21.21711.80522.2870
Br33.02231.80524.0922
H41.06992.28704.0922

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