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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: PBEPBE/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 PBEPBE/6-31G
 hartrees
Energy at 0K-153.597137
Energy at 298.15K-153.601023
HF Energy-153.597137
Nuclear repulsion energy68.602143
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 PBEPBE/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' 3114 3071 10.70 51.66 0.72 0.83
2 A' 2976 2935 1.95 139.54 0.01 0.02
3 A' 2851 2811 140.56 139.93 0.35 0.52
4 A' 1691 1668 112.30 4.38 0.51 0.68
5 A' 1457 1436 25.67 26.58 0.68 0.81
6 A' 1404 1385 4.38 12.60 0.67 0.80
7 A' 1379 1360 39.95 10.74 0.71 0.83
8 A' 1122 1106 28.20 3.48 0.47 0.64
9 A' 896 883 9.05 5.53 0.41 0.58
10 A' 497 490 10.88 1.82 0.57 0.72
11 A" 3045 3003 6.78 75.55 0.75 0.86
12 A" 1469 1448 15.74 18.12 0.75 0.86
13 A" 1113 1097 1.16 0.72 0.75 0.86
14 A" 777 766 3.55 8.49 0.75 0.86
15 A" 153 151 0.03 1.38 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 11970.2 cm-1
Scaled (by 0.9862) Zero Point Vibrational Energy (zpe) 11805.0 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 PBEPBE/6-31G
ABC
1.85746 0.32885 0.29487

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.464 0.000
C2 -0.963 -0.694 0.000
O3 1.241 0.354 0.000
H4 -0.477 1.476 0.000
H5 -0.420 -1.651 0.000
H6 -1.623 -0.638 0.886
H7 -1.623 -0.638 -0.886

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.50641.24541.11872.15612.15302.1530
C21.50642.44042.22351.09981.10641.1064
O31.24542.44042.05192.60333.15763.1576
H41.11872.22352.05193.12682.56262.5626
H52.15611.09982.60333.12681.80471.8047
H62.15301.10643.15762.56261.80471.7728
H72.15301.10643.15762.56261.80471.7728

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.669 C1 C2 H6 110.031
C1 C2 H7 110.031 C2 C1 O3 124.678
C2 C1 H4 114.980 O3 C1 H4 120.342
H5 C2 H6 109.769 H5 C2 H7 109.769
H6 C2 H7 106.485
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/6-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.196      
2 C -0.524      
3 O -0.348      
4 H 0.117      
5 H 0.189      
6 H 0.185      
7 H 0.185      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -2.838 -0.294 0.000 2.854
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.959 -0.655 0.000
y -0.655 -17.845 0.000
z 0.000 0.000 -17.772
Traceless
 xyz
x -3.150 -0.655 0.000
y -0.655 1.520 0.000
z 0.000 0.000 1.630
Polar
3z2-r23.260
x2-y2-3.114
xy-0.655
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.629 0.116 0.000
y 0.116 3.620 0.000
z 0.000 0.000 2.494


<r2> (average value of r2) Å2
<r2> 47.805
(<r2>)1/2 6.914