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All results from a given calculation for HCCBr (bromoacetylene)

using model chemistry: B3LYP/CEP-121G

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 B3LYP/CEP-121G
 hartrees
Energy at 0K-25.156026
Energy at 298.15K-25.158274
HF Energy-25.156026
Nuclear repulsion energy23.550466
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 B3LYP/CEP-121G
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 3441 3353 82.09      
2 Σ 2121 2067 20.91      
3 Σ 553 539 0.62      
4 Π 645 629 81.26      
4 Π 645 629 81.26      
5 Π 273 266 2.55      
5 Π 273 266 2.55      

Unscaled Zero Point Vibrational Energy (zpe) 3975.9 cm-1
Scaled (by 0.9745) Zero Point Vibrational Energy (zpe) 3874.5 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 B3LYP/CEP-121G
B
0.12643

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/CEP-121G

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -2.372
C2 0.000 0.000 -1.150
Br3 0.000 0.000 0.702
H4 0.000 0.000 -3.439

Atom - Atom Distances (Å)
  C1 C2 Br3 H4
C11.22193.07431.0671
C21.22191.85242.2890
Br33.07431.85244.1414
H41.06712.28904.1414

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
Charges from optimized geometry at B3LYP/CEP-121G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.461      
2 C -0.092      
3 Br 0.285      
4 H 0.269      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 -0.310 0.310
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -27.507 0.000 0.000
y 0.000 -27.507 0.000
z 0.000 0.000 -18.697
Traceless
 xyz
x -4.405 0.000 0.000
y 0.000 -4.405 0.000
z 0.000 0.000 8.810
Polar
3z2-r217.619
x2-y20.000
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.945 0.000 0.000
y 0.000 1.945 0.000
z 0.000 0.000 8.980


<r2> (average value of r2) Å2
<r2> 58.428
(<r2>)1/2 7.644