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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: CCSD/6-311G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at CCSD/6-311G*
 hartrees
Energy at 0K-153.436758
Energy at 298.15K 
HF Energy-152.949927
Nuclear repulsion energy69.556650
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 CCSD/6-311G*
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' 3160 3013 11.53      
2 A' 3044 2902 4.06      
3 A' 2938 2801 121.31      
4 A' 1842 1756 138.34      
5 A' 1499 1430 21.18      
6 A' 1454 1386 16.03      
7 A' 1418 1352 18.44      
8 A' 1154 1100 22.61      
9 A' 911 868 4.85      
10 A' 516 492 14.23      
11 A" 3111 2966 12.15      
12 A" 1501 1432 12.15      
13 A" 1154 1100 0.19      
14 A" 789 753 0.84      
15 A" 153 146 0.87      

Unscaled Zero Point Vibrational Energy (zpe) 12321.6 cm-1
Scaled (by 0.9535) Zero Point Vibrational Energy (zpe) 11748.7 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 CCSD/6-311G*
ABC
1.89227 0.33718 0.30232

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD/6-311G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.466 0.000
C2 -0.936 -0.720 0.000
O3 1.205 0.384 0.000
H4 -0.491 1.463 0.000
H5 -0.361 -1.649 0.000
H6 -1.586 -0.682 0.883
H7 -1.586 -0.682 -0.883

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.51011.20741.11202.14552.14732.1473
C21.51012.40832.22751.09251.09731.0973
O31.20742.40832.01012.56683.11503.1150
H41.11202.22752.01013.11512.56462.5646
H52.14551.09252.56683.11511.79311.7931
H62.14731.09733.11502.56461.79311.7662
H72.14731.09733.11502.56461.79311.7662

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.014 C1 C2 H6 109.870
C1 C2 H7 109.870 C2 C1 O3 124.425
C2 C1 H4 115.489 O3 C1 H4 120.086
H5 C2 H6 109.933 H5 C2 H7 109.933
H6 C2 H7 107.176
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability