High-sensitivity continuous wave paramagnetic resonance spectrometer probe

Abstract

The invention discloses a high-sensitivity continuous wave paramagnetic resonance spectrometer probe. The probe comprises a resonant cavity, and a microwave coupling structure and a high-frequency modulation magnetic field coupling structure which are arranged on the resonant cavity, the resonant cavity adopts a cylindrical cavity, and the microwave coupling structure is a first small hole formed in the waveguide access side of the cylindrical cavity; the high-frequency modulation magnetic field coupling structure comprises a plurality of thin-wall copper pipes which vertically penetrate through the cylindrical cavity and are distributed at equal intervals, and Helmholtz coils are wound in the thin-wall copper pipes. According to the invention, the cylindrical cavity with a high Q value is adopted, so that the sensitivity of system detection is improved, a sample area is increased, and a larger function expansion space is provided; besides, the high-efficiency high-frequency modulation magnetic field coupling is realized through the thin-wall copper pipe.

Description

technical field [0001] The invention relates to the technical field of electron paramagnetic resonance, in particular to a high-sensitivity continuous wave paramagnetic resonance spectrometer probe. Background technique [0002] Electron paramagnetic resonance (EPR) is a magnetic resonance technique originating from the magnetic moment of unpaired electrons, which can be used to qualitatively and quantitatively detect unpaired electrons contained in material atoms or molecules, and explore their Structural properties of the surrounding environment. Electron paramagnetic resonance spectrometers are mainly divided into two types: pulse type and continuous wave type. The continuous wave paramagnetic resonance spectrometer obtains the continuous wave EPR spectral line by putting the sample to be tested into a constant frequency microwave field and changing the frequency of the external magnetic field. [0003] In electron paramagnetic resonance experiments, resonant cavities p...

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Problems solved by technology

[0005] The existing resonant cavity has the following problems in the continuous wave paramagnetic resonance spectrometer: (1) The rectangular cavity is often used in the continuous wave electron paramagnetic resonance experiment, but its Q value is low, which is difficult to apply to some low-sensitivity material detection ; (2) Continuous wave paramagnetic resonance spectrometer uses high-frequency small-tuning field technology, which needs to couple a certain intensity of modulation magnetic field into the resonator, and the coupling ability of the existing coupling structure is poor; (3) The sample area is small and the expandable function is weak

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