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 C2H5 (Ethyl radical)

using model chemistry: CCSD=FULL/Def2TZVPP

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 2A'
Energy calculated at CCSD=FULL/Def2TZVPP
 hartrees
Energy at 0K-79.030738
Energy at 298.15K-79.034584
HF Energy-78.630359
Nuclear repulsion energy37.038300
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 CCSD=FULL/Def2TZVPP
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' 3181 3181 12.00      
2 A' 3086 3086 20.21      
3 A' 3008 3008 22.77      
4 A' 1513 1513 1.35      
5 A' 1496 1496 4.19      
6 A' 1425 1425 1.04      
7 A' 1080 1080 0.01      
8 A' 1001 1001 0.45      
9 A' 478 478 55.12      
10 A" 3281 3281 11.25      
11 A" 3128 3128 19.00      
12 A" 1507 1507 4.88      
13 A" 1217 1217 1.84      
14 A" 822 822 1.21      
15 A" 123 123 0.06      

Unscaled Zero Point Vibrational Energy (zpe) 13173.0 cm-1
Scaled (by 1) Zero Point Vibrational Energy (zpe) 13173.0 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 CCSD=FULL/Def2TZVPP
ABC
3.48590 0.76019 0.70517

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD=FULL/Def2TZVPP

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.010 -0.695 0.000
C2 -0.010 0.794 0.000
H3 1.007 -1.098 0.000
H4 -0.508 -1.093 0.882
H5 -0.508 -1.093 -0.882
H6 0.067 1.345 -0.922
H7 0.067 1.345 0.922

Atom - Atom Distances (Å)
  C1 C2 H3 H4 H5 H6 H7
C11.48911.09481.08821.08822.24032.2403
C21.48912.14852.14162.14161.07721.0772
H31.09482.14851.75361.75362.77562.7756
H41.08822.14161.75361.76423.08722.5053
H51.08822.14161.75361.76422.50533.0872
H62.24031.07722.77563.08722.50531.8447
H72.24031.07722.77562.50533.08721.8447

picture of Ethyl radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 H6 120.768 C1 C2 H7 120.768
C2 C1 H3 111.600 C2 C1 H4 111.451
C2 C1 H5 111.451 H3 C1 H4 106.895
H3 C1 H5 106.895 H4 C1 H5 108.310
H6 C2 H7 117.791
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability