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All results from a given calculation for CH3CHO (Acetaldehyde)

using model chemistry: CBS-Q

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 1A'
Energy calculated at CBS-Q
 hartrees
Energy at 0K-153.580815
Energy at 298.15K-153.575953
HF Energy-152.915702
Nuclear repulsion energy70.308783
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 CBS-Q
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
(Å4/u)
Dep P Dep U
1 A' 3308 3308 16.01      
2 A' 3190 3190 7.08      
3 A' 3123 3123 121.36      
4 A' 2028 2028 238.95      
5 A' 1598 1598 15.90      
6 A' 1555 1555 19.75      
7 A' 1519 1519 7.72      
8 A' 1223 1223 27.50      
9 A' 956 956 4.46      
10 A' 543 543 19.68      
11 A" 3251 3251 17.49      
12 A" 1607 1607 8.02      
13 A" 1256 1256 1.62      
14 A" 847 847 0.04      
15 A" 161 161 1.91      

Unscaled Zero Point Vibrational Energy (zpe) 13083.5 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 13083.5 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 CBS-Q
ABC
1.88569 0.33505 0.30047

See section I.F.4 to change rotational constant units
Geometric Data calculated at CBS-Q

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.464 0.000
C2 -0.915 -0.734 0.000
O3 1.182 0.405 0.000
H4 -0.507 1.440 0.000
H5 -0.336 -1.650 0.000
H6 -1.561 -0.703 0.877
H7 -1.561 -0.703 -0.877

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7
C11.50701.18341.09952.14062.13712.1371
C21.50702.38602.21121.08441.08921.0892
O31.18342.38601.98052.55473.08533.0853
H41.09952.21121.98053.09452.54412.5441
H52.14061.08442.55473.09451.77921.7792
H62.13711.08923.08532.54411.77921.7535
H72.13711.08923.08532.54411.77921.7535

picture of Acetaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H5 110.321 C1 C2 H6 109.756
C1 C2 H7 109.756 C2 C1 O3 124.525
C2 C1 H4 115.170 O3 C1 H4 120.305
H5 C2 H6 109.875 H5 C2 H7 109.875
H6 C2 H7 107.202
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability