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: CCSD(T)/daug-cc-pVTZ

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(T)/daug-cc-pVTZ
 hartrees
Energy at 0K-153.599687
Energy at 298.15K 
HF Energy-152.976511
Nuclear repulsion energy69.554457
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(T)/daug-cc-pVTZ
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 3150 3150        
2 A 3099 3099        
3 A 3031 3031        
4 A 2925 2925        
5 A 1778 1778        
6 A 1485 1485        
7 A 1474 1474        
8 A 1417 1417        
9 A 1389 1389        
10 A 1131 1131        
11 A 1129 1129        
12 A 892 892        
13 A 775 775        
14 A 508 508        
15 A 159 159        

Unscaled Zero Point Vibrational Energy (zpe) 12170.6 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 12170.6 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 CCSD(T)/daug-cc-pVTZ
ABC
1.89201 0.33762 0.30256

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

Point Group is C1

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.231 0.403 0.000
C2 -1.169 -0.150 0.000
O3 1.235 -0.278 -0.000
H4 0.307 1.508 0.000
H5 -1.150 -1.239 0.000
H6 -1.704 0.220 0.880
H7 -1.704 0.219 -0.881

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.50511.21361.10812.14512.13332.1333
C21.50512.40832.22021.08941.09421.0942
O31.21362.40832.01272.57213.10863.1084
H41.10812.22022.01273.10982.54552.5457
H52.14511.08942.57213.10981.79151.7915
H62.13331.09423.10862.54551.79151.7607
H72.13331.09423.10842.54571.79151.7607

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.526 C1 C2 H6 109.296
C1 C2 H7 109.296 C2 C1 O3 124.361
C2 C1 H4 115.506 O3 C1 H4 120.133
H5 C2 H6 110.258 H5 C2 H7 110.258
H6 C2 H7 107.135
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability