Electron paramagnetic resonance

electron paramagnetic resonance measures resonant transitions involving unpaired electron magnetic moments. A spin label attached to a protein or lipid can report local motion or distances under appropriately designed pulse experiments.

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- Axial spin-three-halves resonance coincidence Electron paramagnetic resonance

Axial spin-three-halves resonance coincidence ( $h ν = D$ )

For

H = D S_{z}^{2} + g μ_{B} B S_{z}

with

D > 0

and a transverse oscillating field, the allowed gaps are

g μ_{B} B

,

∣ g μ_{B} B - 2 D ∣

and

g μ_{B} B + 2 D

. Below

h ν = 2 D

, the positive-field solutions are

h ν

,

2 D - h ν

and

2 D + h ν

in units of

g μ_{B} B

. At

h ν = D

two transitions coincide, leaving two distinct resonance fields. At

h ν = 2 D

a zero-field resonance must be counted separately.

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Electron paramagnetic resonance by

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Electron Paramagnetic Resonance (EPR), also known as Electron Spin Resonance (ESR), is a spectroscopic technique used to study materials that have unpaired electrons. These unpaired electrons can originate from a variety of sources, including free radicals, transition metal complexes, and certain types of defects in solids. ### Key Principles: 1. **Magnetic Moments**: Unpaired electrons possess a magnetic moment due to their spin, allowing them to interact with magnetic fields.

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