return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: PBEPBE/3-21G

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/3-21G
 hartrees
Energy at 0K-152.790212
Energy at 298.15K-152.794100
HF Energy-152.790212
Nuclear repulsion energy68.480730
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/3-21G
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' 3101 3073 8.67 48.47 0.70 0.82
2 A' 2975 2948 0.79 112.49 0.01 0.03
3 A' 2784 2759 149.71 122.30 0.35 0.51
4 A' 1699 1684 85.32 2.94 0.42 0.59
5 A' 1470 1456 24.83 27.23 0.71 0.83
6 A' 1410 1397 1.96 12.58 0.70 0.82
7 A' 1372 1360 43.21 9.93 0.72 0.84
8 A' 1099 1089 28.49 3.16 0.49 0.66
9 A' 857 850 14.63 5.11 0.36 0.53
10 A' 477 472 8.58 1.37 0.56 0.72
11 A" 3034 3006 4.32 67.94 0.75 0.86
12 A" 1491 1477 15.03 18.78 0.75 0.86
13 A" 1120 1110 1.59 1.22 0.75 0.86
14 A" 786 779 4.53 7.78 0.75 0.86
15 A" 166 164 0.03 1.28 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 11919.8 cm-1
Scaled (by 0.9909) Zero Point Vibrational Energy (zpe) 11811.3 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/3-21G
ABC
1.87413 0.32515 0.29242

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.462 0.000
C2 -0.957 -0.718 0.000
O3 1.237 0.385 0.000
H4 -0.534 1.448 0.000
H5 -0.395 -1.664 0.000
H6 -1.613 -0.664 0.890
H7 -1.613 -0.664 -0.890

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.51931.23971.12172.16162.15912.1591
C21.51932.45642.20731.10021.10691.1069
O31.23972.45642.06572.61953.16533.1653
H41.12172.20732.06573.11492.53342.5334
H52.16161.10022.61953.11491.81001.8100
H62.15911.10693.16532.53341.81001.7796
H72.15911.10693.16532.53341.81001.7796

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.197 C1 C2 H6 109.601
C1 C2 H7 109.601 C2 C1 O3 125.521
C2 C1 H4 112.527 O3 C1 H4 121.952
H5 C2 H6 110.188 H5 C2 H7 110.188
H6 C2 H7 107.010
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C 0.212      
2 C -0.698      
3 O -0.377      
4 H 0.157      
5 H 0.237      
6 H 0.235      
7 H 0.235      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  -2.424 -0.340 0.000 2.448
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -20.374 -0.682 0.000
y -0.682 -18.011 0.000
z 0.000 0.000 -17.798
Traceless
 xyz
x -2.470 -0.682 0.000
y -0.682 1.075 0.000
z 0.000 0.000 1.394
Polar
3z2-r22.789
x2-y2-2.363
xy-0.682
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 4.214 0.139 0.000
y 0.139 3.471 0.000
z 0.000 0.000 2.316


<r2> (average value of r2) Å2
<r2> 47.980
(<r2>)1/2 6.927