Lecture 27: Homonuclear Diatomic Molecules-II The material in this lecture covers the following in Atkins. 14 Molecular structure Molecular Orbital Theory.

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Presentation transcript:

Lecture 27: Homonuclear Diatomic Molecules-II The material in this lecture covers the following in Atkins. 14 Molecular structure Molecular Orbital Theory 14.5 The structure of diatomic molecules (f) The structures of homonuclear diatomic molecules 14.5 More about notation (a) parity (b) Term Symbols Lecture on-line Homonuclear diatomic molecules (PowerPoint) Homonuclear diatomic molecules (PDF) Handout for this lecture

Audio-visuals on-line Shape of molecular orbitals in homonuclear diatomic molecules (PowerPoint)(From the Wilson Group,***) Shape of molecular orbitals in homonuclear diatomic molecules (PDF)(From the Wilson Group,***) Composition of orbitals in homonuclear molecules (6 MB MBQuick-Time with music) (A must from the Wilson Group,*****) The Occupation of homonuclear diatomic orbitals (PowerPoint)(From the Wilson Group,***) The Occupation of homonuclear diatomic orbitals(PDF) (From the Wilson Group,***)

An alternative molecular orbital energy level diagram for homonuclear diatomic molecules. As remarked in the text, this diagram should be used for diatomics up to and including N 2.

The variation of the orbital energies of Period 2 homonuclear diatomics. The g and u labels are explained later (Section 14.6a).

The variation of the orbital energies of Period 2 homonuclear diatomics. The g and u labels are explained later (Section 14.6a).

The variation of the orbital energies of Period 2 homonuclear diatomics. The g and u labels are explained later (Section 14.6a).

An alternative molecular orbital energy level diagram for homonuclear diatomic molecules. As remarked in the text, this diagram should be used for diatomics up to and including N 2.

The parity of an orbital is even (g) if its wavefunction is unchanged under inversion in the centre of symmetry of the molecule, but odd (u) if the wavefunction changes sign. Heteronuclear diatomic molecules do not have a centre of inversion, so for them the g,u classification is irrelevant.

The parity of an orbital is even (g) if its wavefunction is unchanged under inversion in the centre of symmetry of the molecule, but odd (u) if the wavefunction changes sign. Heteronuclear diatomic molecules do not have a centre of inversion, so for them the g,u classification is irrelevant.

The  in a term symbol refers to the symmetry of an orbital when it is reflected in a plane containing the two nuclei.