A quartz tube air removal device for commercial epr/esr
A quartz tube and air cavity technology, applied in the field of quartz tube air removal devices, can solve the problems of troublesome operation, high cost, large consumption of helium, etc., and achieve the effects of convenient operation, reduced consumption and rapid removal
Active Publication Date: 2021-06-01
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology
Usually the way to clean the quartz sample tube in the laboratory is to blow the quartz with a weak helium flow to drive away the air, but this method needs to be operated carefully, it is not convenient, and the amount of helium is also large
Another method is to remove the air in a professional glove box, but it is expensive and troublesome to operate
Method used
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[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0016] like figure 1 As shown, a quartz tube air removal device for commercial EPR / ESR includes a ventilation cavity 8, one side of the ventilation cavity 8 is communicated with the dry vacuum pump 1 through the first vacuum valve 4, and the ventilation cavity 8 is connected to the first vacuum valve 4. A vacuum pressure gauge 5 is connected to a bypass between the vacuum valves 4, the other side of the ventilation chamber 8 communicates with the gas cylinder 20 through the second vacuum valve 17, and the side between the ventilation chamber 8 and the second vacuum valve 17 A safety valve 14 is connected to the gas exchange chamber. The top and bottom of the ventilation chamber 8 are respectively provided with through holes communicating with the chamber. 11, and the top of the ventilation cavity 8 is provided with a sealing fixture for fixing the quar...
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The invention discloses a quartz tube air removal device for commercial EPR / ESR, which comprises a ventilation chamber, one side of the ventilation chamber communicates with a dry vacuum pump through a first vacuum valve and a vacuum pressure gauge, and the other side of the ventilation chamber The second vacuum valve and the safety valve are connected to the gas cylinder. The top and bottom of the ventilation chamber are respectively provided with through holes communicating with the chamber. The through holes on the top are coaxially plugged with quartz caps and sealed and fixed by sealing fixtures. , the through hole at the bottom is used for the coaxial insertion of the quartz tube and is sealed and fixed by the sealing fixture. The invention can efficiently and quickly remove the air in the quartz sample tube, effectively reduces the amount of helium gas used, and is more convenient for experimenters to operate.
Description
technical field [0001] The invention relates to the field of quartz tubes for electron paramagnetic resonance, in particular to a quartz tube air removal device for commercial EPR / ESR. Background technique [0002] Electron paramagnetic resonance is to detect the resonant absorption effect of incident microwaves when the energy level of a sample with unpaired electrons undergoes Zeeman splitting under the action of an external magnetic field. Because the air contains a lot of oxygen, oxygen itself is a molecule with unpaired electrons, which will cause the resonance absorption signal to be mixed with the oxygen molecule signal when measuring the sample, contaminating the intrinsic signal of the sample. Especially in an experiment, the sample itself is easy to react with oxygen, or when the product is produced with oxygen during the reaction, it is more necessary to ensure that there is no oxygen from the air in the quartz sample tube, so as to improve the reliability of the ...
Claims
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Login to View More IPC IPC(8): G01N24/10
CPCG01N24/10
Inventor 王永强童伟张仕乐皮雳
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI