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: MP2/6-31G(2df,p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2/6-31G(2df,p)
 hartrees
Energy at 0K-152.197270
Energy at 298.15K-152.197935
HF Energy-151.683234
Nuclear repulsion energy58.065186
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 MP2/6-31G(2df,p)
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A' 3847 3633 126.90      
2 A' 3562 3364 96.01      
3 A' 2267 2141 96.37      
4 A' 1270 1200 92.68      
5 A' 1085 1025 76.16      
6 A' 596 563 47.19      
7 A' 378 357 8.82      
8 A" 529 500 39.32      
9 A" 379 358 17.42      

Unscaled Zero Point Vibrational Energy (zpe) 6956.0 cm-1
Scaled (by 0.9445) Zero Point Vibrational Energy (zpe) 6569.9 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 MP2/6-31G(2df,p)
ABC
22.10648 0.32308 0.31842

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G(2df,p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.120 0.000
C2 0.105 1.325 0.000
O3 -0.188 -1.179 0.000
H4 0.205 2.379 0.000
H5 0.672 -1.614 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5
C11.20931.31222.26811.8589
C21.20932.52041.05892.9923
O31.31222.52043.57910.9634
H42.26811.05893.57914.0193
H51.85892.99230.96344.0193

picture of ethynol state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H4 179.523 C1 O3 H5 108.581
C2 C1 O3 176.724
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability