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 H2CO (Formaldehyde)

using model chemistry: PBE1PBE/6-31+G**

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C2V 1A1
Energy calculated at PBE1PBE/6-31+G**
 hartrees
Energy at 0K-114.377495
Energy at 298.15K-114.378939
HF Energy-114.377495
Nuclear repulsion energy31.279426
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 PBE1PBE/6-31+G**
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 2938 2806 62.28 158.96 0.17 0.29
2 A1 1857 1774 117.28 9.25 0.29 0.45
3 A1 1540 1471 6.23 12.62 0.57 0.73
4 B1 1201 1148 5.31 1.26 0.75 0.86
5 B2 3005 2871 120.89 104.33 0.75 0.86
6 B2 1266 1209 9.66 3.27 0.75 0.86

Unscaled Zero Point Vibrational Energy (zpe) 5903.4 cm-1
Scaled (by 0.9553) Zero Point Vibrational Energy (zpe) 5639.5 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 PBE1PBE/6-31+G**
ABC
9.44355 1.29641 1.13992

See section I.F.4 to change rotational constant units
Geometric Data calculated at PBE1PBE/6-31+G**

Point Group is C2v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.000 0.676
C2 0.000 0.000 -0.529
H3 0.000 0.941 -1.115
H4 0.000 -0.941 -1.115

Atom - Atom Distances (Å)
  O1 C2 H3 H4
O11.20472.02282.0228
C21.20471.10851.1085
H32.02281.10851.8821
H42.02281.10851.8821

picture of Formaldehyde state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 H3 121.901 O1 C2 H4 121.901
H3 C2 H4 116.198
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBE1PBE/6-31+G** Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 O -0.306      
2 C 0.053      
3 H 0.126      
4 H 0.126      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 -2.502 2.502
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -11.728 0.000 0.000
y 0.000 -11.642 0.000
z 0.000 0.000 -12.288
Traceless
 xyz
x 0.237 0.000 0.000
y 0.000 0.366 0.000
z 0.000 0.000 -0.603
Polar
3z2-r2-1.205
x2-y2-0.086
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 1.319 0.000 0.000
y 0.000 2.283 0.000
z 0.000 0.000 3.129


<r2> (average value of r2) Å2
<r2> 17.012
(<r2>)1/2 4.125