H3 | O1 - O2
The multiplicity is 2.

## Atomic Charges and Dipole Moment

O1 charge=-0.224
O2 charge=-0.180
H3 charge= 0.405
with a dipole moment of 2.52010 Debye

## Bond Lengths:

between O1 and O2: distance=1.359 ang___ between O1 and H3: distance=0.991 ang___

## Bond Angles:

for H3-O1-O2: angle=104.4 deg___

## Bond Orders (Mulliken):

between O1 and O2: order=0.936___ between O1 and H3: order=0.857___

## Best Lewis Structure

The Lewis structure that is closest to your structure is determined. The hybridization of the atoms in this idealized Lewis structure is given in the table below. The Lewis structure is built for the up and down electrons, separately. Note that the up and down structures can be very different.

### Hybridization in the Best Lewis Structure

#### Down Electrons

1. A bonding orbital for O1-O2 with 0.9992 electrons
__has 50.48% O 1 character in a s0.53 p3 hybrid
__has 49.52% O 2 character in a s0.43 p3 hybrid

2. A bonding orbital for O1-H3 with 0.9977 electrons
__has 74.00% O 1 character in a s0.81 p3 hybrid
__has 26.00% H 3 character in a s orbital

5. A lone pair orbital for O1 with 0.9994 electrons

6. A lone pair orbital for O1 with 0.9984 electrons
__made from a p-pi orbital ( 99.96% p)

7. A lone pair orbital for O2 with 0.9998 electrons

8. A lone pair orbital for O2 with 0.9986 electrons
__made from a p-pi orbital ( 99.98% p)

9. A lone pair orbital for O2 with 0.9956 electrons
__made from a s0.08 p3 hybrid

-With core pairs on: O 1 O 2 -

#### Up Electrons

1. A bonding orbital for O1-O2 with 0.9992 electrons
__has 56.78% O 1 character in a s0.65 p3 hybrid
__has 43.22% O 2 character in a s0.50 p3 hybrid

2. A bonding orbital for O1-H3 with 0.9980 electrons
__has 73.32% O 1 character in a s0.82 p3 hybrid
__has 26.68% H 3 character in a s orbital

5. A lone pair orbital for O1 with 0.9994 electrons

6. A lone pair orbital for O1 with 0.9028 electrons
__made from a p-pi orbital ( 99.92% p 0.08% d)

7. A lone pair orbital for O2 with 0.9996 electrons

8. A lone pair orbital for O2 with 0.9950 electrons
__made from a s0.10 p3 hybrid

-With core pairs on: O 1 O 2 -

#### Donor Acceptor Interactions in the Best Lewis Structure

The localized orbitals in your best Lewis structure can interact strongly. A filled bonding or lone pair orbital can act as a donor and an empty or filled bonding, antibonding, or lone pair orbital can act as an acceptor. These interactions can strengthen and weaken bonds. For example, a lone pair donor->antibonding acceptor orbital interaction will weaken the bond associated with the antibonding orbital. Conversly, an interaction with a bonding pair as the acceptor will strengthen the bond. Strong electron delocalization in your best Lewis structure will also show up as donor-acceptor interactions.
Interactions greater than 20 kJ/mol for bonding and lone pair orbitals are listed below.

The interaction of the second lone pair donor orbital, 6, for O1 with the third lone pair acceptor orbital, 9, for O2 is 207. kJ/mol.

## Molecular Orbital Energies

The orbital energies are given in eV, where 1 eV=96.49 kJ/mol. Orbitals with very low energy are core 1s orbitals. More antibonding orbitals than you might expect are sometimes listed, because d orbitals are always included for heavy atoms and p orbitals are included for H atoms. Up spins are shown with a ^ and down spins are shown as v. Only the spin up electron orbital energies are given.

13 ----- 7.849
12 ----- 7.353

11 ----- 0.477

10 ----- -0.536

9 -^--- -6.870
8 -^-v- -6.980

7 -^-v- -11.79
6 -^-v- -11.92

5 -^-v- -14.05

4 -^-v- -21.59

3 -^-v- -29.83

2 -^-v- -508.7 1 -^-v- -510.1

## Total Electronic Energy

The total electronic energy is a very large number, so by convention the units are given in atomic units, that is Hartrees (H). One Hartree is 2625.5 kJ/mol. The energy reference is for totally dissociated atoms. In other words, the reference state is a gas consisting of nuclei and electrons all at infinite distance from each other. The electronic energy includes all electric interactions and the kinetic energy of the electrons. This energy does not include translation, rotation, or vibration of the the molecule.

Total electronic energy = -150.9782936173 Hartrees