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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: MP2/6-31+G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2/6-31+G**
 hartrees
Energy at 0K-153.389076
Energy at 298.15K-153.392984
HF Energy-152.925172
Nuclear repulsion energy69.377383
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 MP2/6-31+G**
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' 3253 3060 6.32 44.59 0.74 0.85
2 A' 3117 2932 2.86 147.02 0.01 0.02
3 A' 3018 2838 109.86 147.99 0.32 0.49
4 A' 1770 1665 129.58 8.93 0.45 0.62
5 A' 1509 1419 21.95 13.15 0.68 0.81
6 A' 1453 1367 12.11 8.31 0.34 0.50
7 A' 1425 1340 16.25 3.28 0.68 0.81
8 A' 1162 1093 21.65 2.89 0.32 0.48
9 A' 920 865 6.12 5.77 0.39 0.56
10 A' 512 482 12.97 1.51 0.39 0.56
11 A" 3204 3014 5.92 61.51 0.75 0.86
12 A" 1515 1425 11.82 7.68 0.75 0.86
13 A" 1155 1087 0.01 0.85 0.75 0.86
14 A" 792 745 0.89 5.55 0.75 0.86
15 A" 140 131 1.35 1.19 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12472.0 cm-1
Scaled (by 0.9406) Zero Point Vibrational Energy (zpe) 11731.2 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 MP2/6-31+G**
ABC
1.89060 0.33596 0.30114

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.463 0.000
C2 -0.952 -0.698 0.000
O3 1.222 0.357 0.000
H4 -0.467 1.464 0.000
H5 -0.405 -1.637 0.000
H6 -1.596 -0.638 0.879
H7 -1.596 -0.638 -0.879

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.50081.22631.10452.13852.12872.1287
C21.50082.41592.21531.08691.09141.0914
O31.22632.41592.01872.57353.11493.1149
H41.10452.21532.01873.10152.54292.5429
H52.13851.08692.57353.10151.78581.7858
H62.12871.09143.11492.54291.78581.7577
H72.12871.09143.11492.54291.78581.7577

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.442 C1 C2 H6 109.399
C1 C2 H7 109.399 C2 C1 O3 124.419
C2 C1 H4 115.658 O3 C1 H4 119.922
H5 C2 H6 110.135 H5 C2 H7 110.135
H6 C2 H7 107.271
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability