Electron Spin Resonance

Condensed Matter Physics

Investigate interactions of electron spin:

• external magnetic field
• chemical environment
• nucleus
• among themselves (eg: How far apart do atoms need to be before spins do not interact?)

Setup:

• Source of energy: Microwave clystron: 10 GHz
• When E interaction matches the energy of microwave photons, can system can absorb microwaves
• Measure signal reflected
• Scan over field strength
• Instrumentation to control the magnet
• Gauss meter to measure B-field
• Scope and Computer to do DAQ

Crystal structure of Cu-sulfate Electron and Nucleus interaction