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 HCCOH (ethynol)

using model chemistry: PBEPBEultrafine/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at PBEPBEultrafine/6-31G*
 hartrees
Energy at 0K-152.352351
Energy at 298.15K-152.352827
HF Energy-152.352351
Nuclear repulsion energy57.595505
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 PBEPBEultrafine/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A' 3583 3524 56.47      
2 A' 3448 3391 78.63      
3 A' 2240 2204 103.12      
4 A' 1231 1211 90.75      
5 A' 1072 1054 79.50      
6 A' 571 561 43.81      
7 A' 330 324 8.39      
8 A" 492 484 33.09      
9 A" 310 305 23.14      

Unscaled Zero Point Vibrational Energy (zpe) 6638.5 cm-1
Scaled (by 0.9835) Zero Point Vibrational Energy (zpe) 6529.0 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 PBEPBEultrafine/6-31G*
ABC
21.52033 0.31852 0.31387

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.120 0.000
C2 -0.013 1.338 0.000
O3 -0.093 -1.197 0.000
H4 0.008 2.409 0.000
H5 0.810 -1.582 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5
C11.21791.32032.28921.8848
C21.21792.53611.07163.0334
O31.32032.53613.60770.9812
H42.28921.07163.60774.0708
H51.88483.03340.98124.0708

picture of ethynol state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H4 178.276 C1 O3 H5 109.068
C2 C1 O3 175.375
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBEultrafine/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.128      
2 C -0.165      
3 O -0.578      
4 H 0.183      
5 H 0.432      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  1.657 -0.790 0.000 1.836
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -16.331 -2.898 0.002
y -2.898 -11.996 -0.021
z 0.002 -0.021 -18.196
Traceless
 xyz
x -1.235 -2.898 0.002
y -2.898 5.268 -0.021
z 0.002 -0.021 -4.032
Polar
3z2-r2-8.065
x2-y2-4.335
xy-2.898
xz0.002
yz-0.021


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.779 -0.264 -0.000
y -0.264 5.551 0.006
z -0.000 0.006 1.476


<r2> (average value of r2) Å2
<r2> 41.006
(<r2>)1/2 6.404