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/aug-cc-pVDZ

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/aug-cc-pVDZ
 hartrees
Energy at 0K-152.148017
Energy at 298.15K-152.148468
HF Energy-151.686501
Nuclear repulsion energy57.345179
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/aug-cc-pVDZ
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' 3786 3630 130.52      
2 A' 3503 3359 89.45      
3 A' 2198 2108 133.03      
4 A' 1254 1202 86.67      
5 A' 1053 1009 76.47      
6 A' 535 513 51.96      
7 A' 315 302 7.29      
8 A" 492 472 46.51      
9 A" 304 292 14.24      

Unscaled Zero Point Vibrational Energy (zpe) 6719.5 cm-1
Scaled (by 0.959) Zero Point Vibrational Energy (zpe) 6444.0 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 MP2/aug-cc-pVDZ
ABC
21.94191 0.31477 0.31032

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/aug-cc-pVDZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.119 0.000
C2 -0.008 1.347 0.000
O3 -0.095 -1.204 0.000
H4 0.007 2.419 0.000
H5 0.799 -1.582 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5
C11.22871.32622.30061.8788
C21.22872.55301.07203.0383
O31.32622.55303.62490.9698
H42.30061.07203.62494.0788
H51.87883.03830.96984.0788

picture of ethynol state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H4 178.820 C1 O3 H5 108.831
C2 C1 O3 175.532
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability