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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: MP2/cc-pVTZ

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/cc-pVTZ
 hartrees
Energy at 0K-153.542153
Energy at 298.15K-153.546083
HF Energy-152.974175
Nuclear repulsion energy69.722393
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/cc-pVTZ
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' 3205 3044 5.36 43.07 0.73 0.85
2 A' 3076 2921 1.84 153.22 0.01 0.01
3 A' 2955 2805 114.08 150.86 0.29 0.45
4 A' 1783 1693 117.94 7.06 0.68 0.81
5 A' 1477 1402 19.92 12.00 0.63 0.77
6 A' 1437 1365 8.75 7.23 0.35 0.52
7 A' 1385 1315 22.29 2.17 0.68 0.81
8 A' 1142 1085 21.82 2.45 0.21 0.34
9 A' 905 859 7.06 5.63 0.33 0.49
10 A' 507 481 12.96 1.55 0.43 0.60
11 A" 3157 2997 4.61 57.67 0.75 0.86
12 A" 1490 1415 9.51 6.39 0.75 0.86
13 A" 1139 1082 0.03 1.08 0.75 0.86
14 A" 781 742 0.99 3.89 0.75 0.86
15 A" 159 151 0.87 0.86 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12298.7 cm-1
Scaled (by 0.9495) Zero Point Vibrational Energy (zpe) 11677.7 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/cc-pVTZ
ABC
1.90645 0.33912 0.30398

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/cc-pVTZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.461 0.000
C2 -0.939 -0.706 0.000
O3 1.209 0.370 0.000
H4 -0.483 1.456 0.000
H5 -0.385 -1.640 0.000
H6 -1.586 -0.652 0.876
H7 -1.586 -0.652 -0.876

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.49871.21291.10542.13602.12662.1266
C21.49872.40322.20961.08541.09021.0902
O31.21292.40322.01092.56513.10243.1024
H41.10542.20962.01093.09682.53512.5351
H52.13601.08542.56513.09681.78441.7844
H62.12661.09023.10242.53511.78441.7526
H72.12661.09023.10242.53511.78441.7526

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.477 C1 C2 H6 109.447
C1 C2 H7 109.447 C2 C1 O3 124.482
C2 C1 H4 115.271 O3 C1 H4 120.248
H5 C2 H6 110.205 H5 C2 H7 110.205
H6 C2 H7 106.991
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability