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 C2H5OO (ethylperoxy radical)

using model chemistry: HF/STO-3G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 2A'
Energy calculated at HF/STO-3G
 hartrees
Energy at 0K-225.367345
Energy at 298.15K-225.373348
HF Energy-225.367345
Nuclear repulsion energy122.473674
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 HF/STO-3G
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' 3761 3071 0.08      
2 A' 3577 2921 0.21      
3 A' 3569 2914 2.54      
4 A' 1833 1496 1.43      
5 A' 1811 1479 2.45      
6 A' 1730 1413 3.11      
7 A' 1645 1343 28.25      
8 A' 1429 1167 16.31      
9 A' 1371 1120 3.80      
10 A' 1247 1018 0.21      
11 A' 1070 873 0.48      
12 A' 557 455 2.17      
13 A' 330 269 0.44      
14 A" 3763 3072 0.20      
15 A" 3686 3009 4.23      
16 A" 1815 1482 1.78      
17 A" 1491 1217 0.22      
18 A" 1332 1088 9.21      
19 A" 944 771 0.29      
20 A" 220 180 0.44      
21 A" 95 78 0.29      

Unscaled Zero Point Vibrational Energy (zpe) 18637.5 cm-1
Scaled (by 0.8165) Zero Point Vibrational Energy (zpe) 15217.5 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 HF/STO-3G
ABC
1.09070 0.14466 0.13413

See section I.F.4 to change rotational constant units
Geometric Data calculated at HF/STO-3G

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.517 0.921 0.000
C2 0.000 0.657 0.000
O3 -0.196 -0.789 0.000
O4 -1.532 -1.040 0.000
H5 1.704 1.991 0.000
H6 1.975 0.485 0.882
H7 1.975 0.485 -0.882
H8 -0.468 1.097 -0.887
H9 -0.468 1.097 0.887

Atom - Atom Distances (Å)
  C1 C2 O3 O4 H5 H6 H7 H8 H9
C11.53952.42003.62441.08571.08571.08572.18132.1813
C21.53951.45912.28582.16412.17032.17031.09541.0954
O32.42001.45911.35913.36682.66752.66752.10202.1020
O43.62442.28581.35914.43333.92463.92462.54642.5464
H51.08572.16413.36684.43331.76571.76572.51112.5111
H61.08572.17032.66753.92461.76571.76443.07842.5193
H71.08572.17032.66753.92461.76571.76442.51933.0784
H82.18131.09542.10202.54642.51113.07842.51931.7740
H92.18131.09542.10202.54642.51112.51933.07841.7740

picture of ethylperoxy radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 O3 107.588 C1 C2 H8 110.627
C1 C2 H9 110.627 C2 C1 H5 109.837
C2 C1 H6 110.329 C2 C1 H7 110.329
C2 O3 O4 108.353 O3 C2 H8 109.931
O3 C2 H9 109.931 H5 C1 H6 108.806
H5 C1 H7 108.806 H6 C1 H7 108.693
H8 C2 H9 108.141
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at HF/STO-3G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.183      
2 C 0.007      
3 O -0.150      
4 O -0.020      
5 H 0.070      
6 H 0.072      
7 H 0.072      
8 H 0.065      
9 H 0.065      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.502 1.623 0.000 1.699
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.865 -0.359 0.000
y -0.359 -23.069 0.000
z 0.000 0.000 -21.405
Traceless
 xyz
x -0.628 -0.359 0.000
y -0.359 -0.934 0.000
z 0.000 0.000 1.562
Polar
3z2-r23.125
x2-y20.204
xy-0.359
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.710 0.591 0.000
y 0.591 2.245 0.000
z 0.000 0.000 1.789


<r2> (average value of r2) Å2
<r2> 89.319
(<r2>)1/2 9.451