return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for HCCBr (bromoacetylene)

using model chemistry: mPW1PW91/6-311G**

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 mPW1PW91/6-311G**
 hartrees
Energy at 0K-2651.022952
Energy at 298.15K-2651.025319
HF Energy-2651.022952
Nuclear repulsion energy124.233905
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 mPW1PW91/6-311G**
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 3503 3351 97.54      
2 Σ 2199 2104 26.13      
3 Σ 618 591 1.68      
4 Π 656 627 45.57      
4 Π 656 627 45.57      
5 Π 304 291 6.42      
5 Π 304 291 6.42      

Unscaled Zero Point Vibrational Energy (zpe) 4118.8 cm-1
Scaled (by 0.9567) Zero Point Vibrational Energy (zpe) 3940.5 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 mPW1PW91/6-311G**
B
0.13414

See section I.F.4 to change rotational constant units
Geometric Data calculated at mPW1PW91/6-311G**

Point Group is C∞v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -2.306
C2 0.000 0.000 -1.106
Br3 0.000 0.000 0.681
H4 0.000 0.000 -3.368

Atom - Atom Distances (Å)
  C1 C2 Br3 H4
C11.20002.98701.0624
C21.20001.78692.2624
Br32.98701.78694.0493
H41.06242.26244.0493

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 mPW1PW91/6-311G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.093      
2 C -0.123      
3 Br 0.095      
4 H 0.120      


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 -0.219 0.219
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -30.585 0.000 0.000
y 0.000 -30.585 0.000
z 0.000 0.000 -21.796
Traceless
 xyz
x -4.394 0.000 0.000
y 0.000 -4.394 0.000
z 0.000 0.000 8.788
Polar
3z2-r217.577
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 2.628 0.000 0.000
y 0.000 2.628 0.000
z 0.000 0.000 8.902


<r2> (average value of r2) Å2
<r2> 84.093
(<r2>)1/2 9.170