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/cc-pVDZ

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/cc-pVDZ
 hartrees
Energy at 0K-78.909246
Energy at 298.15K-78.913093
HF Energy-78.603600
Nuclear repulsion energy36.580437
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/cc-pVDZ
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' 3170 3003 12.80      
2 A' 3096 2933 25.68      
3 A' 3013 2854 27.26      
4 A' 1488 1409 1.49      
5 A' 1472 1394 3.31      
6 A' 1404 1330 0.15      
7 A' 1083 1026 0.05      
8 A' 988 936 0.19      
9 A' 444 421 42.69      
10 A" 3277 3104 14.33      
11 A" 3140 2975 21.47      
12 A" 1483 1405 3.67      
13 A" 1198 1135 1.90      
14 A" 806 764 1.18      
15 A" 147 140 0.14      

Unscaled Zero Point Vibrational Energy (zpe) 13104.4 cm-1
Scaled (by 0.9473) Zero Point Vibrational Energy (zpe) 12413.8 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/cc-pVDZ
ABC
3.37423 0.74514 0.69088

See section I.F.4 to change rotational constant units
Geometric Data calculated at CCSD/cc-pVDZ

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 -0.014 -0.701 0.000
C2 -0.014 0.801 0.000
H3 1.019 -1.112 0.000
H4 -0.520 -1.105 0.895
H5 -0.520 -1.105 -0.895
H6 0.093 1.359 -0.937
H7 0.093 1.359 0.937

Atom - Atom Distances (Å)
  C1 C2 H3 H4 H5 H6 H7
C11.50171.11171.10531.10532.26562.2656
C21.50172.17412.16602.16601.09611.0961
H31.11172.17411.78071.78072.80072.8007
H41.10532.16601.78071.79043.13162.5398
H51.10532.16601.78071.79042.53983.1316
H62.26561.09612.80073.13162.53981.8747
H72.26561.09612.80072.53983.13161.8747

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 120.609 C1 C2 H7 120.609
C2 C1 H3 111.727 C2 C1 H4 111.469
C2 C1 H5 111.469 H3 C1 H4 106.875
H3 C1 H5 106.875 H4 C1 H5 108.176
H6 C2 H7 117.554
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability