Microwave Electron Spin Resonance Apparatus

Electron Spin Resonance (ESR), otherwise known as Electron Paramagnetic Resonance (EPR) refers to the phenomenon that electron spin magnetic moment, under influence imposed by the radiofrequency electromagnetic field, resonates and transits between various magnetic energy levels in the constant magnetic field. Such phenomenon can only take place in the paramagnetic materials in which atoms have non-zero intrinsic magnetic moment. First observed by former Soviet physicist Yevgeny Zavoisky in 1944, EPR is quite analogous to Nuclear Magnetic Resonance (NMR) that was brought up by Purcell, Paund, Bloch and Hanson etc. in 1945 and employed to study the ESR phenomenon.

Experiments

1. Comprehend and master the functions and adjustment methods of each microwave waveguide component.

2. Understand the basic principles of ESR as well as compare its characteristics with those of NMR.  

3. Observe the phenomenon of electron spin resonance in the microwave band and measure the Landé g-factor of the electrons existed in the DPPH sample’s radicals.   

4. Understand the status involving stationary wave formed by the wave TE10 in the resonant cavity, adjust the length of the sample cavity, measure various resonance points and determine the waveguide wavelength.

5. Estimate the DPPH sample’s transverse relaxation time depending upon the spectral linewidth of such sample.

Specifications

Packing List