Note: Some Lectures
(Power Point) are under
construction!

A GOAL is to post a lecture before we discuss a topic in class, but I can't promise!

COPYRIGHT: All lectures are copyrighted by C.W. Myles!

No reproduction &/or use of them other than by students in this course is allowed!

A GOAL is to post a lecture before we discuss a topic in class, but I can't promise!

COPYRIGHT: All lectures are copyrighted by C.W. Myles!

No reproduction &/or use of them other than by students in this course is allowed!

- Phonons I: Crystal Vibrations
- (Material on Lattice Vibrations from Kittel's Ch. 4 plus MANY other sources).
- This material & that on Elastic
Properties are related.

- See Elastic Properties
**Lectures**. - .
**Part I****:****A. Born-Oppenheimer (Adiabatic) Approximation.****Reduction of the Many Electron, Many Ion Problem to****Independent Electron & Ion Problems.****B. Harmonic Approximation for Lattice Vibrations.****Reduction of the Many Ion Problem to the Lattice Vibrations****Problem. Treatment of Lattice Vibrations as Classical Normal Modes.**

**Part II****:****Model Calculations of Normal Modes.****The One-Dimensional Monatomic Chain Model.****T****he One-Dimensional Diatomic Chain Model.**

**Part III****:****Vibrational Normal Modes****in Crystalline Materials.****("Phonon Dispersion Relations" in Crystals) Overview****Results from Neutron & X-Ray Scattering Experiments.****Some Lattice Dynamics Models ("Theories") Used to Predict****Normal Modes in Crystals.**

**Part IV****:****Lattice Vibrations in Clathrate Semiconductors.****Not in the Text! From my research notes.**

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