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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: MP2=FULL/STO-3G

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=FULL/STO-3G
 hartrees
Energy at 0K-151.118836
Energy at 298.15K-151.122631
HF Energy-150.940656
Nuclear repulsion energy67.400117
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=FULL/STO-3G
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' 3564 3168 0.65 23.13 0.75 0.86
2 A' 3370 2995 0.01 36.21 0.02 0.04
3 A' 3294 2928 40.72 44.70 0.33 0.49
4 A' 1779 1582 17.12 3.73 0.75 0.86
5 A' 1708 1518 6.98 13.49 0.75 0.85
6 A' 1587 1410 1.57 4.89 0.75 0.86
7 A' 1504 1337 13.33 9.36 0.75 0.86
8 A' 1203 1069 21.77 5.18 0.53 0.69
9 A' 978 869 3.82 5.44 0.35 0.52
10 A' 500 445 5.10 1.14 0.57 0.72
11 A" 3545 3151 0.58 27.71 0.75 0.86
12 A" 1712 1522 2.55 14.15 0.75 0.86
13 A" 1176 1046 0.72 0.50 0.75 0.86
14 A" 807 718 1.33 2.87 0.75 0.86
15 A" 151 134 0.35 0.42 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 13438.3 cm-1
Scaled (by 0.8889) Zero Point Vibrational Energy (zpe) 11945.3 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=FULL/STO-3G
ABC
1.80558 0.31395 0.28183

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/STO-3G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.483 0.000
C2 -0.979 -0.733 0.000
O3 1.258 0.387 0.000
H4 -0.519 1.480 0.000
H5 -0.419 -1.683 0.000
H6 -1.626 -0.695 0.893
H7 -1.626 -0.695 -0.893

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.56071.26161.12442.20532.19782.1978
C21.56072.50162.26021.10261.10401.1040
O31.26162.50162.08632.66353.20763.2076
H41.12442.26022.08633.16422.59922.5992
H52.20531.10262.66353.16421.79761.7976
H62.19781.10403.20762.59921.79761.7869
H72.19781.10403.20762.59921.79761.7869

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.614 C1 C2 H6 109.951
C1 C2 H7 109.951 C2 C1 O3 124.498
C2 C1 H4 113.661 O3 C1 H4 121.841
H5 C2 H6 109.110 H5 C2 H7 109.110
H6 C2 H7 108.054
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability