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: HF/cc-pVTZ

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 HF/cc-pVTZ
 hartrees
Energy at 0K-2648.720008
Energy at 298.15K-2648.722651
HF Energy-2648.720008
Nuclear repulsion energy124.439457
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 HF/cc-pVTZ
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 3624 3298 95.62      
2 Σ 2354 2142 14.96      
3 Σ 639 582 0.19      
4 Π 812 739 46.53      
4 Π 812 739 46.53      
5 Π 363 330 10.05      
5 Π 363 330 10.05      

Unscaled Zero Point Vibrational Energy (zpe) 4482.8 cm-1
Scaled (by 0.9101) Zero Point Vibrational Energy (zpe) 4079.8 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 HF/cc-pVTZ
B
0.13479

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/cc-pVTZ

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 -1.115
Br3 0.000 0.000 0.680
H4 0.000 0.000 -3.348

Atom - Atom Distances (Å)
  C1 C2 Br3 H4
C11.17932.97471.0535
C21.17931.79542.2329
Br32.97471.79544.0283
H41.05352.23294.0283

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 HF/cc-pVTZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.088      
2 C -0.141      
3 Br 0.022      
4 H 0.208      


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 -0.510 0.510
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -31.030 0.000 0.000
y 0.000 -31.030 0.000
z 0.000 0.000 -21.931
Traceless
 xyz
x -4.550 0.000 0.000
y 0.000 -4.550 0.000
z 0.000 0.000 9.099
Polar
3z2-r218.198
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 3.498 0.000 0.000
y 0.000 3.498 0.000
z 0.000 0.000 8.842


<r2> (average value of r2) Å2
<r2> 83.941
(<r2>)1/2 9.162