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 CH3OO (methylperoxy radical)

using model chemistry: MP2/CEP-31G

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/CEP-31G
 hartrees
Energy at 0K-38.694668
Energy at 298.15K-38.698215
HF Energy-38.424319
Nuclear repulsion energy41.982343
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/CEP-31G
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' 3226 3117 24.10      
2 A' 3070 2967 33.40      
3 A' 1521 1469 18.10      
4 A' 1486 1436 30.36      
5 A' 1395 1348 108.12      
6 A' 1167 1128 0.17      
7 A' 874 845 17.93      
8 A' 453 438 4.61      
9 A" 3207 3099 43.34      
10 A" 1500 1449 7.68      
11 A" 1126 1088 0.47      
12 A" 113 109 1.60      

Unscaled Zero Point Vibrational Energy (zpe) 9568.5 cm-1
Scaled (by 0.9663) Zero Point Vibrational Energy (zpe) 9246.0 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/CEP-31G
ABC
1.63722 0.34577 0.30273

See section I.F.4 to change rotational constant units
Geometric Data calculated at MP2/CEP-31G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.052 -0.503 0.000
O2 0.000 0.589 0.000
O3 -1.272 0.060 0.000
H4 2.004 0.054 0.000
H5 0.930 -1.112 0.914
H6 0.930 -1.112 -0.914

Atom - Atom Distances (Å)
  C1 O2 O3 H4 H5 H6
C11.51662.39111.10321.10481.1048
O21.51661.37792.07422.14372.1437
O32.39111.37793.27602.65672.6567
H41.10322.07423.27601.82981.8298
H51.10482.14372.65671.82981.8274
H61.10482.14372.65671.82981.8274

picture of methylperoxy radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 O2 O3 111.304 O2 C1 H4 103.570
O2 C1 H5 108.709 O2 C1 H6 108.709
H4 C1 H5 111.933 H4 C1 H6 111.933
H5 C1 H6 111.589
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability