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 H2COO (Dioxymethyl radical)

using model chemistry: MP2=FULL/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 2A'
Energy calculated at MP2=FULL/3-21G
 hartrees
Energy at 0K-187.850918
Energy at 298.15K-187.853263
HF Energy-187.512935
Nuclear repulsion energy67.111256
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 MP2=FULL/3-21G
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' 3329 3178 2.27      
2 A' 3178 3034 1.89      
3 A' 1535 1466 1.95      
4 A' 1297 1238 37.49      
5 A' 1211 1156 23.72      
6 A' 615 587 196.03      
7 A' 385 367 74.72      
8 A" 1010 965 45.53      
9 A" 667 636 0.50      

Unscaled Zero Point Vibrational Energy (zpe) 6612.3 cm-1
Scaled (by 0.9548) Zero Point Vibrational Energy (zpe) 6313.4 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 MP2=FULL/3-21G
ABC
2.30904 0.38667 0.33121

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2=FULL/3-21G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
O1 0.000 0.514 0.000
C2 1.105 -0.158 0.000
H3 1.055 -1.239 0.000
H4 2.029 0.405 0.000
O5 -1.215 -0.291 0.000

Atom - Atom Distances (Å)
  O1 C2 H3 H4 O5
O11.29352.04602.03151.4568
C21.29351.08251.08122.3239
H32.04601.08251.91092.4598
H42.03151.08121.91093.3170
O51.45682.32392.45983.3170

picture of Dioxymethyl radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O1 C2 H3 118.607 O1 C2 H4 117.341
C2 O1 O5 115.200 H3 C2 H4 124.051
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability