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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: G3

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at G3
 hartrees
Energy at 0K-153.714793
Energy at 298.15K-153.709879
HF Energy-152.915965
Nuclear repulsion energy70.311433
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 HF/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' 3320 3128 15.74 53.09 0.70 0.82
2 A' 3206 3020 8.49 134.52 0.01 0.03
3 A' 3151 2969 116.63 100.35 0.45 0.62
4 A' 2032 1915 221.46 9.67 0.55 0.71
5 A' 1606 1514 15.30 20.74 0.72 0.84
6 A' 1566 1475 20.43 6.75 0.52 0.68
7 A' 1536 1447 7.04 3.39 0.75 0.86
8 A' 1231 1160 27.49 3.74 0.46 0.63
9 A' 965 909 4.51 7.55 0.31 0.47
10 A' 547 515 20.12 1.03 0.45 0.63
11 A" 3260 3072 18.07 73.40 0.75 0.86
12 A" 1616 1523 8.48 14.89 0.75 0.86
13 A" 1264 1191 1.54 0.68 0.75 0.86
14 A" 856 806 0.02 7.29 0.75 0.86
15 A" 152 144 1.85 0.97 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 13153.9 cm-1
Scaled (by 0.9422) Zero Point Vibrational Energy (zpe) 12393.6 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/6-31G*
ABC
1.88615 0.33656 0.30159

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.464 0.000
C2 -0.948 -0.700 0.000
O3 1.218 0.362 0.000
H4 -0.478 1.465 0.000
H5 -0.386 -1.635 0.000
H6 -1.596 -0.652 0.881
H7 -1.596 -0.652 -0.881

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.50161.22241.10892.13392.13792.1379
C21.50162.41252.21581.09011.09481.0948
O31.22242.41252.02312.56103.11853.1185
H41.10892.21582.02313.10082.55172.5517
H52.13391.09012.56103.10081.79011.7901
H62.13791.09483.11852.55171.79011.7621
H72.13791.09483.11852.55171.79011.7621

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.247 C1 C2 H6 109.861
C1 C2 H7 109.861 C2 C1 O3 124.419
C2 C1 H4 115.356 O3 C1 H4 120.225
H5 C2 H6 109.833 H5 C2 H7 109.833
H6 C2 H7 107.153
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability