Introduction

Electron paramagnetic resonance (EPR) is a magnetic resonance technique derived from the magnetic moment of unpaired electrons that can be used to detect qualitatively and quantitatively the unpaired electrons contained in atoms or molecules of matter and to explore the structural properties of their surroundings. For free radicals, the orbital magnetic moment has little effect, and most of the contribution (more than 99%) of the total magnetic moment comes from the electron spin, so the electron paramagnetic resonance is also called "electron spin resonance" (ESR).

Electron paramagnetic resonance is an important method to detect paramagnetic substances (such as free radicals, transition metal ions, etc.) containing uncoupled electrons in the fields of basic science and applied science. Mainly used to analyze vacancies, metal valence states, photocatalytic free radical experiments in materials, PMS catalytic oxidation experiments, antioxidant experiments (radical inhibition, scavenging), etc.

Apply EPR/ESR can test:

--Vacancies: vacancies of oxygen, carbon, nitrogen and sulfur.

--The valence of metal ion.

--Free radical.

--Void.

Representive Results

1. Caption: Singlet oxygen signal intensity-Light time map

2. Caption: Superoxide Radical Spectrum

3. Caption: carbon dioxide free radicals

4. Caption: Oxygen vacancies

5. Caption: Hydroxyl Radical Test Spectrum

Sample Requirement

1. Block sample

20*20mm.

2. Powder sample

more than 10mg.

3. Liquid sample

above 0.5ml.