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 CH3CH2O (Ethoxy radical)

using model chemistry: ROHF/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 ROHF/cc-pVDZ
 hartrees
Energy at 0K-153.472690
Energy at 298.15K 
HF Energy-153.472690
Nuclear repulsion energy74.181987
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 ROHF/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' 3256 2802 38.14      
2 A' 3182 2738 12.89      
3 A' 3156 2716 39.44      
4 A' 1596 1374 4.03      
5 A' 1551 1335 16.64      
6 A' 1528 1315 11.58      
7 A' 1491 1283 6.58      
8 A' 1188 1022 8.49      
9 A' 1160 998 35.24      
10 A' 959 825 2.96      
11 A' 454 390 6.18      
12 A" 3266 2811 42.97      
13 A" 3194 2749 18.86      
14 A" 1579 1359 2.98      
15 A" 1358 1169 0.65      
16 A" 923 794 0.03      
17 A" 291 251 9.38      
18 A" 30i 26i 13.32      

Unscaled Zero Point Vibrational Energy (zpe) 15048.6 cm-1
Scaled (by 0.8607) Zero Point Vibrational Energy (zpe) 12952.3 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 ROHF/cc-pVDZ
ABC
1.29443 0.32294 0.28583

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

Point Group is Cs

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 1.047 -0.572 0.000
C2 0.000 0.529 0.000
O3 -1.302 0.056 0.000
H4 2.053 -0.146 0.000
H5 0.939 -1.203 0.884
H6 0.939 -1.203 -0.884
H7 0.101 1.179 0.876
H8 0.101 1.179 -0.876

Atom - Atom Distances (Å)
  C1 C2 O3 H4 H5 H6 H7 H8
C11.51852.43061.09281.09181.09182.17422.1742
C21.51851.38462.16142.15932.15931.09581.0958
O32.43061.38463.36092.71822.71821.99861.9986
H41.09282.16143.36091.77181.77182.51732.5173
H51.09182.15932.71821.77181.76822.52553.0783
H61.09182.15932.71821.77181.76823.07832.5255
H72.17421.09581.99862.51732.52553.07831.7521
H82.17421.09581.99862.51733.07832.52551.7521

picture of Ethoxy radical state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 C2 O3 113.625 C1 C2 H7 111.519
C1 C2 H8 111.519 C2 C1 H4 110.669
C2 C1 H5 110.566 C2 C1 H6 110.566
O3 C2 H7 106.791 O3 C2 H8 106.791
H4 C1 H5 108.400 H4 C1 H6 108.400
H5 C1 H6 108.155 H7 C2 H8 106.153
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at ROHF/cc-pVDZ Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.072      
2 C 0.138      
3 O -0.266      
4 H 0.027      
5 H 0.041      
6 H 0.041      
7 H 0.045      
8 H 0.045      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  1.796 0.637 0.000 1.906
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.204 0.155 0.000
y 0.155 -18.839 0.000
z 0.000 0.000 -17.962
Traceless
 xyz
x -3.803 0.155 0.000
y 0.155 1.244 0.000
z 0.000 0.000 2.559
Polar
3z2-r25.118
x2-y2-3.364
xy0.155
xz0.000
yz0.000


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


<r2> (average value of r2) Å2
<r2> 50.866
(<r2>)1/2 7.132