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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: MP2=FULL/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=FULL/6-31G*
 hartrees
Energy at 0K-153.358969
Energy at 298.15K-153.362891
HF Energy-152.913503
Nuclear repulsion energy69.398636
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/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' 3237 3050 5.61 46.54 0.73 0.85
2 A' 3107 2927 1.65 108.26 0.01 0.03
3 A' 2993 2820 120.25 119.47 0.33 0.49
4 A' 1801 1697 97.78 4.22 0.59 0.74
5 A' 1527 1439 17.81 21.75 0.71 0.83
6 A' 1467 1383 12.95 10.70 0.55 0.71
7 A' 1439 1356 18.14 4.08 0.75 0.86
8 A' 1168 1100 21.98 3.63 0.48 0.65
9 A' 926 873 6.04 6.01 0.39 0.56
10 A' 515 485 13.13 1.27 0.45 0.62
11 A" 3187 3003 5.57 62.88 0.75 0.86
12 A" 1535 1446 10.70 14.84 0.75 0.86
13 A" 1170 1102 0.71 0.70 0.75 0.86
14 A" 799 753 1.01 8.00 0.75 0.86
15 A" 148 139 0.49 1.04 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12509.3 cm-1
Scaled (by 0.9422) Zero Point Vibrational Energy (zpe) 11786.2 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=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 109.828 C1 C2 H6 109.869
C1 C2 H7 109.869 C2 C1 O3 124.341
C2 C1 H4 115.340 O3 C1 H4 120.320
H5 C2 H6 110.030 H5 C2 H7 110.030
H6 C2 H7 107.179
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability