Electron Paramagnetic Resonance Spectrometer

EPR is the only research method that can directly track unpaired electrons, providing in situ and non-destructive information on microscopic scales such as electrons, orbits and nuclei. If the electromagnetic wave with frequency v satisfies the condition of hv=gβH in the direction perpendicular to H, the electrons at the low energy level will absorb the energy of the electromagnetic wave and transit to the high energy level, which is the electron paramagnetic resonance. EPR can only study paramagnetic substances.

Sample Requirements

• The powder sample is more than 10-20 mg.
• The liquid sample is more than 2 ml.
• For void measurement, the block/film is required to be within 3 mm in two directions and within 1 cm in the other direction.
• Free radicals are pre-treated outside, and there is no requirement for the size of bulk / film samples.

Application

• Field of physics
• Research on crystal defects, radiation effects and radiation damage, doping of semiconductor paramagnetic ions;
• Study crystal fields in single crystals, magnetic properties of materials, etc.
• Field of biology and medicine
• Research on drug detection, control of irradiated food, carcinogen response;
• Research on reactive oxygen species, blood and microbes.
• Other research fields
• Study of radiation dosimetry and alanine / EPR dosimetry;
• Dating of geological and archaeological samples.

Instrument and Result Display

FAQ

Q1. Is lighting required and how to choose the number of test time points?

A. If the sample is a photocatalytic material or a material that changes significantly before and after light, it is necessary to measure the spectra in two different states of darkness and light. The number of lighting test points is the number of points collected at different lighting times. If you want to observe the dynamic changes of the spectral peak shape and peak intensity under the sample illumination conditions, you can collect more spectra at several illumination time points.

Q2. How is the g factor obtained?

A. hv=gβH, h is Planck's constant, g is the spectral splitting factor (referred to as g factor or g value), and β is the natural unit of electronic magnetic moment, called Bohr magneton. As long as H remains constant, the g factor is calculated accordingly.

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For more information about our electron paramagnetic resonance spectrometer testing services, please contact us.