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All results from a given calculation for CH3CHO (Acetaldehyde)

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

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at MP2/6-31G**
 hartrees
Energy at 0K-153.378467
Energy at 298.15K-153.382391
HF Energy-152.920318
Nuclear repulsion energy69.445019
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 MP2/6-31G**
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' 3265 3058 6.79 45.96 0.74 0.85
2 A' 3129 2930 2.11 110.88 0.01 0.03
3 A' 3006 2816 123.40 119.56 0.32 0.49
4 A' 1801 1687 97.85 4.28 0.59 0.74
5 A' 1522 1426 14.84 20.97 0.70 0.83
6 A' 1467 1374 11.70 10.16 0.55 0.71
7 A' 1431 1340 14.75 4.12 0.75 0.86
8 A' 1162 1089 21.98 3.51 0.44 0.61
9 A' 921 862 6.03 6.07 0.38 0.55
10 A' 511 478 13.19 1.31 0.46 0.63
11 A" 3216 3011 6.96 61.52 0.75 0.86
12 A" 1533 1435 8.62 14.24 0.75 0.86
13 A" 1164 1090 0.51 0.75 0.75 0.86
14 A" 795 745 0.52 7.50 0.75 0.86
15 A" 149 140 0.53 0.99 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 12535.4 cm-1
Scaled (by 0.9365) Zero Point Vibrational Energy (zpe) 11739.4 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 MP2/6-31G**
ABC
1.89221 0.33655 0.30161

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.464 0.000
C2 -0.948 -0.702 0.000
O3 1.218 0.363 0.000
H4 -0.481 1.460 0.000
H5 -0.390 -1.634 0.000
H6 -1.593 -0.651 0.878
H7 -1.593 -0.651 -0.878

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.50251.22241.10582.13382.13322.1332
C21.50252.41352.21131.08611.09061.0906
O31.22242.41352.02272.56373.11443.1144
H41.10582.21132.02273.09482.54182.5418
H52.13381.08612.56373.09481.78421.7842
H62.13321.09063.11442.54181.78421.7559
H72.13321.09063.11442.54181.78421.7559

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 109.991 C1 C2 H6 109.684
C1 C2 H7 109.684 C2 C1 O3 124.356
C2 C1 H4 115.095 O3 C1 H4 120.549
H5 C2 H6 110.106 H5 C2 H7 110.106
H6 C2 H7 107.225
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability