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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: QCISD(T)/daug-cc-pVDZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at QCISD(T)/daug-cc-pVDZ
 hartrees
Energy at 0K-153.465987
Energy at 298.15K 
HF Energy-152.937026
Nuclear repulsion energy68.932102
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 QCISD(T)/daug-cc-pVDZ
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 3148 3148        
2 A 3093 3093        
3 A 3018 3018        
4 A 2913 2913        
5 A 1753 1753        
6 A 1456 1456        
7 A 1445 1445        
8 A 1403 1403        
9 A 1354 1354        
10 A 1124 1124        
11 A 1112 1112        
12 A 901 901        
13 A 771 771        
14 A 500 500        
15 A 190 190        

Unscaled Zero Point Vibrational Energy (zpe) 12090.6 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 12090.6 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 QCISD(T)/daug-cc-pVDZ
ABC
1.85662 0.33191 0.29744

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)/daug-cc-pVDZ

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.232 0.405 -0.000
C2 -1.179 -0.151 -0.000
O3 1.246 -0.280 0.000
H4 0.310 1.523 -0.000
H5 -1.161 -1.253 -0.001
H6 -1.718 0.222 0.891
H7 -1.719 0.225 -0.889

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.51661.22461.11982.16522.15142.1514
C21.51662.42872.24051.10131.10641.1064
O31.22462.42872.03122.59603.13593.1366
H41.11982.24052.03123.14082.56862.5677
H52.16521.10132.59603.14081.81181.8118
H62.15141.10643.13592.56861.81181.7804
H72.15141.10643.13662.56771.81181.7804

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.593 C1 C2 H6 109.214
C1 C2 H7 109.214 C2 C1 O3 124.405
C2 C1 H4 115.569 O3 C1 H4 120.027
H5 C2 H6 110.304 H5 C2 H7 110.304
H6 C2 H7 107.136
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability