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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: MP2/6-311+G(3df,2p)

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2/6-311+G(3df,2p)
 hartrees
Energy at 0K-153.538279
Energy at 298.15K-153.542205
HF Energy-152.972989
Nuclear repulsion energy69.750594
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 MP2/6-311+G(3df,2p)
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' 3203 3022 4.93 38.59 0.73 0.85
2 A' 3073 2899 1.80 165.88 0.01 0.01
3 A' 2956 2789 101.06 147.33 0.29 0.45
4 A' 1778 1677 135.94 10.46 0.43 0.60
5 A' 1481 1398 22.57 9.28 0.56 0.72
6 A' 1431 1350 10.22 5.40 0.26 0.42
7 A' 1391 1312 20.34 1.46 0.72 0.84
8 A' 1143 1078 22.56 3.01 0.16 0.28
9 A' 905 854 6.90 5.39 0.30 0.46
10 A' 508 480 12.85 1.51 0.30 0.46
11 A" 3154 2976 3.94 53.62 0.75 0.86
12 A" 1492 1407 10.20 3.72 0.75 0.86
13 A" 1136 1072 0.01 1.11 0.75 0.86
14 A" 778 734 1.46 2.75 0.75 0.86
15 A" 158 149 1.44 0.85 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12293.4 cm-1
Scaled (by 0.9434) Zero Point Vibrational Energy (zpe) 11597.6 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 MP2/6-311+G(3df,2p)
ABC
1.90404 0.33965 0.30435

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/6-311+G(3df,2p)

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.462 0.000
C2 -0.938 -0.707 0.000
O3 1.208 0.369 0.000
H4 -0.479 1.459 0.000
H5 -0.387 -1.642 0.000
H6 -1.585 -0.650 0.877
H7 -1.585 -0.650 -0.877

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.49831.21171.10622.13942.12502.1250
C21.49832.40102.21361.08591.09071.0907
O31.21172.40102.00822.56763.09973.0997
H41.10622.21362.00823.10252.53742.5374
H52.13941.08592.56763.10251.78521.7852
H62.12501.09073.09972.53741.78521.7531
H72.12501.09073.09972.53741.78521.7531

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.747 C1 C2 H6 109.316
C1 C2 H7 109.316 C2 C1 O3 124.401
C2 C1 H4 115.581 O3 C1 H4 120.018
H5 C2 H6 110.207 H5 C2 H7 110.207
H6 C2 H7 106.965
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability