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Conferences & lectures

Electron Spin Echo Envelope Modulation (ESEEM) Spectroscopy


Date & time
Thursday, November 27, 2014
3 p.m. – 5 p.m.
Speaker(s)

Lin LI, Dr. Sushil Misra’s PhD student

Cost

This event is free

Organization

Department of Physics

Contact

Marie-Anne Cheong Youne
514 848-2424 ext. 3270

Where

Central Building
7141 Sherbrooke W.
Room CC-204

Wheel chair accessible

Yes

Electron Spin Echo Envelope Modulation (ESEEM) is a pulse electron paramagnetic resonance (EPR) technique employed for the study of small hyperfine interactions in paramagnetic systems in solid samples. It helps us understand how metal ions function in biological systems and provide information such as 3D structure and protein dynamics.

Two-pulse and three-pulse ESEEM are introduced in this presentation with classical and quantum mechanical descriptions. First classically, the effect of the microwave pulses on the spin system is described by the vector model using Bloch equations. Then quantum mechanically, a spin coupled system of electron spin S=1/2 and nuclear spin I=1/2, in an ESEEM experiment, is described by a density matrix using Liouville-von Neumann equation.  Time domain-and frequency domain-spectra for two-pulse and three-pulse ESEEM experiments will be exhibited.

It will be shown how to obtain the hyperfine splitting from the peaks in the frequency-domain spectrum.

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