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Rectangular electron paramagnetic resonance (EPR) probe for exo-cavity sample detection

A paramagnetic resonance and rectangular technology, applied in the probe field of electron paramagnetic resonance detection, to achieve the effect of easy processing and production, fast estimation and simple structure

Active Publication Date: 2013-04-03
INST OF RADIATION MEDICINE ACAD OF MILITARY MEDICAL SCI OF THE PLA
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  • Abstract
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  • Claims
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Problems solved by technology

Due to the problems of sampling and experimental conditions,

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  • Rectangular electron paramagnetic resonance (EPR) probe for exo-cavity sample detection

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Embodiment Construction

[0012] The microwave cavity in the probe has a length of 22.86 mm, a width of 10.16 mm, and a height of 21.40 mm. The thickness of the structure wall is 1.50 mm. The structure material is copper and the surface is plated with silver. The width of the rectangular longitudinal through opening of the polygonal detection port is 3 mm, the depth is 2 mm, and the wide side of the open trapezoid is 6 mm. The modulation coil is fixed at 5cm on both sides of the center of the detection port, and a 100kHz modulation current is applied. The probe is connected with the microwave system of the paramagnetic resonance spectrometer through the coupling and tuning unit and the waveguide. The microwave resonant frequency is 9.55G Hz, and the microwave field type in the cavity is a rectangular cavity TE101. The practical application effect is as follows: using the probe described in the present invention to detect diphenylpicrylhydrazine free radical (DPPH) spot samples, good EPR spectral lines ...

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Abstract

The invention relates to a probe capable of carrying out electron paramagnetic resonance (EPR) detection on an external sample. The probe is rectangular in both external shape and internal cavity, the mode of resonance is TE101, and the top face of the probe is provided with an open polygonal sample detection port. The detection port longitudinally penetrates into the space of the internal cavity along the wall thickness direction and runs through along the thickness direction of the probe. Long sides of the detection port are vertical to the direction of a microwave magnetic-field component of the internal cavity at the long sides and parallel to the direction of current lines on cavity walls at the long sides. A pair of coils providing modulation magnetic fields is placed at the two sides of the detection port, and modulation magnetic fields required for paramagnetic resonance are generated at the position of the detection port by the coils. A coupling and tuning unit carries out coupling by adopting a coupling diaphragm with a coupling hole and adjusts a coupling constant for the cavity and a microwave system by using adjusting bolts outside the coupling hole. The probe is mainly used for carrying out local detection on samples which are inconveniently sampled and made into samples.

Description

technical field [0001] The invention relates to an electron paramagnetic resonance detection device, in particular to a probe capable of performing electron paramagnetic resonance detection on an external sample. The microwave in the probe works in the X-band rectangular TE101 mode, and the main shape of the inner cavity and the outer body of the probe are rectangular. This special electron paramagnetic resonance probe can directly detect the surface of the sample to be tested, which is inconvenient to sample and sample preparation, so as to obtain the local electron paramagnetic resonance spectrum of the sample. It belongs to the technical field of new technologies and methods of biophysics. Background technique [0002] Electron paramagnetic resonance, or EPR for short, is a technique that allows researchers to probe and characterize molecules with unpaired electrons without altering or destroying them. This technique can be used to analyze the content and properties of p...

Claims

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Application Information

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IPC IPC(8): G01N24/10
Inventor 吴可郭俊旺袁清泉丛建波董国福马蕾
Owner INST OF RADIATION MEDICINE ACAD OF MILITARY MEDICAL SCI OF THE PLA
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