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: QCISD(T)/aug-cc-pVTZ

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 2A'
Energy calculated at QCISD(T)/aug-cc-pVTZ
 hartrees
Energy at 0K-79.008156
Energy at 298.15K-79.011995
HF Energy-78.628592
Nuclear repulsion energy36.908931
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 QCISD(T)/aug-cc-pVTZ
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' 3151 3047        
2 A' 3058 2957        
3 A' 2977 2878        
4 A' 1495 1445        
5 A' 1477 1428        
6 A' 1407 1360        
7 A' 1067 1032        
8 A' 990 957        
9 A' 468 452        
10 A" 3253 3145        
11 A" 3102 2999        
12 A" 1496 1446        
13 A" 1201 1161        
14 A" 807 781        
15 A" 128 124        

Unscaled Zero Point Vibrational Energy (zpe) 13038.6 cm-1
Scaled (by 0.9668) Zero Point Vibrational Energy (zpe) 12605.7 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 QCISD(T)/aug-cc-pVTZ
ABC
3.45543 0.75582 0.70093

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD(T)/aug-cc-pVTZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.011 -0.697 0.000
C2 -0.011 0.796 0.000
H3 1.012 -1.101 0.000
H4 -0.510 -1.097 0.886
H5 -0.510 -1.097 -0.886
H6 0.068 1.349 -0.926
H7 0.068 1.349 0.926

Atom - Atom Distances (Å)
  C1 C2 H3 H4 H5 H6 H7
C11.49281.09991.09281.09282.24752.2475
C21.49282.15562.14882.14881.08201.0820
H31.09992.15561.76101.76102.78512.7851
H41.09282.14881.76101.77223.09892.5138
H51.09282.14881.76101.77222.51383.0989
H62.24751.08202.78513.09892.51381.8529
H72.24751.08202.78512.51383.09891.8529

picture of Ethyl radical state 1 conformation 1
More geometry information
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability