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

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
 hartrees
Energy at 0K-151.900175
Energy at 298.15K-151.900439
HF Energy-151.593000
Nuclear repulsion energy56.649307
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
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' 3638 3481 70.26      
2 A' 3511 3360 62.33      
3 A' 2184 2090 51.65      
4 A' 1264 1209 127.07      
5 A' 986 944 80.56      
6 A' 592 566 55.21      
7 A' 282 270 10.23      
8 A" 505 483 56.70      
9 A" 181 173 1.23      

Unscaled Zero Point Vibrational Energy (zpe) 6571.3 cm-1
Scaled (by 0.9568) Zero Point Vibrational Energy (zpe) 6287.4 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
ABC
22.56584 0.30668 0.30257

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-31G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.137 0.000
C2 -0.297 1.330 0.000
O3 0.146 -1.212 0.000
H4 -0.467 2.384 0.000
H5 1.084 -1.495 0.000

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5
C11.22941.35722.29421.9594
C21.22942.58061.06683.1447
O31.35722.58063.64740.9802
H42.29421.06683.64744.1770
H51.95943.14470.98024.1770

picture of ethynol state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H4 175.170 C1 O3 H5 112.924
C2 C1 O3 172.175
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability