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/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes CS 2A'
Energy calculated at QCISD/6-31G*
 hartrees
Energy at 0K-78.869044
Energy at 298.15K-78.872908
HF Energy-78.596645
Nuclear repulsion energy36.806384
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/6-31G*
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' 3185 3033 14.42      
2 A' 3094 2946 27.57      
3 A' 3014 2870 26.89      
4 A' 1534 1461 3.62      
5 A' 1517 1445 1.94      
6 A' 1458 1388 0.89      
7 A' 1093 1041 0.07      
8 A' 1023 974 0.28      
9 A' 457 435 52.48      
10 A" 3284 3127 18.96      
11 A" 3136 2986 23.79      
12 A" 1540 1467 4.12      
13 A" 1233 1175 2.21      
14 A" 831 792 1.75      
15 A" 145 138 0.31      

Unscaled Zero Point Vibrational Energy (zpe) 13272.4 cm-1
Scaled (by 0.9523) Zero Point Vibrational Energy (zpe) 12639.3 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/6-31G*
ABC
3.43134 0.75232 0.69813

See section I.F.4 to change rotational constant units
Geometric Data calculated at QCISD/6-31G*

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.013 -0.698 0.000
C2 -0.013 0.797 0.000
H3 1.011 -1.110 0.000
H4 -0.518 -1.097 0.888
H5 -0.518 -1.097 -0.888
H6 0.089 1.353 -0.928
H7 0.089 1.353 0.928

Atom - Atom Distances (Å)
  C1 C2 H3 H4 H5 H6 H7
C11.49501.10371.09731.09732.25332.2533
C21.49502.16482.15272.15271.08661.0866
H31.10372.16481.76821.76822.78912.7891
H41.09732.15271.76821.77643.11012.5250
H51.09732.15271.76821.77642.52503.1101
H62.25331.08662.78913.11012.52501.8561
H72.25331.08662.78912.52503.11011.8561

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 120.770 C1 C2 H7 120.770
C2 C1 H3 111.946 C2 C1 H4 111.370
C2 C1 H5 111.370 H3 C1 H4 106.909
H3 C1 H5 106.909 H4 C1 H5 108.088
H6 C2 H7 117.323
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability