We have already told you about the operating principle of NMR. Electron Paramagnetic Resonance (EPR) works on a similar principle, but instead of observing the nuclei of atoms, it detects the "unpaired" electrons present in certain systems (molecular, biological, materials).

Imagine an electron as a tiny spinning top. This rotation creates a minuscule magnet. In the presence of a magnetic field, these electrons orient themselves, much like compasses. By sending radio waves of the right frequency, we can make these electronic tops "tilt." Each magnetic ion/paramagnetic species has a very specific EPR signature, which allows for a very detailed chemical analysis of the system being analyzed. But the EPR signal will also change depending on the electron's immediate environment, thus allowing us to probe the structure of matter where other techniques cannot.

Credits: Elisabetta Mileo (BIP)

Why use high magnetic fields?

Increasing the magnetic field has two major effects: first, it increases the sensitivity of the measurement (less material needs to be analyzed), and second, it improves the spectral "resolution." That is to say, it allows us to distinguish two signals which, at a low magnetic field, are too close and therefore overlap.

At high fields, these signals separate and are therefore distinguishable, offering a much more precise analysis of the material.

💡And you, what project would you like to see this technology applied to? Don't hesitate to contact us!