Bending multi-stage rod ion focusing transmission component

Abstract

The invention discloses a bending multi-stage rod ion focusing transmission component, which comprises a plurality of bending conductive rods distributed in central symmetry and forming a bending space structure, and a support base. Each bending conductive rod consists of a straight section and a bending section, wherein the straight section is a cylindrical structure or a conical structure, the bending section is a cylindrical structure or a conical structure, the top end face of the straight section is the bottom end face of the bending section, and the top end of the bending section converges to the central axis to form a centrosymmetrical distribution structure around the central axis. The bending space structure has large entrance aperture and small exit aperture. The field strength of the bending space structure can be further increased, and moreover, the size of the exit can be further reduced, and the ion focusing performance can be enhanced. Meanwhile, because the size of theexit is further reduced, the background of detection can be further reduced, and the overall sensitivity of detection can be improved. Because of the existence of the straight sections, an ion beam entering at high speed can be further stabilized for better focusing in next step.

Description

technical field [0001] The invention relates to the field of ion focus transmission, in particular to an ion focus transmission component based on a bent multistage rod. Background technique [0002] A mass spectrometer is a highly sensitive and high-resolution instrument used to detect the chemical composition of a substance. It first converts the sample into gaseous ions, and then separates the ions according to the mass-to-charge ratio (m / z) through an electric field or a magnetic field. , and then measure the intensity of the ions to form a mass spectrum. According to the mass spectrum, the chemical composition of the substance can be obtained qualitatively or quantitatively. [0003] Analyte ions for analysis by mass spectrometry can be generated by any of a variety of ionization systems. For example, AP-MALDI, APPI, ESI, APCI, and ICP systems can be used in mass spectrometry systems to generate ions. Many of these systems generate ions at or near atmospheric pressu...

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Problems solved by technology

[0006] According to the description of the prior art in the background of this patent, since the calibers of the ion beam entrance and the ion beam exit are the same, it is impossible to meet the requirements at the same time at a lower cost or in a simple way without increasing the cost and complexity of the overall equipment. degree, and at the same time can improve the focusing ability; and the bending type multi-stage rod ion focusing transmission part disclosed in the present invention adopts the bending type multi-stage rod ion focusing transmission part with the ion beam entrance diameter larger than the ion beam exit diameter , can make the mechanism easy and convenient to manufacture, and can also reduce a certain cost, improve the ion focusing ability, and improve the final detection sensitivity. Under the action, it will enter the focusing transmission part at high speed, which will cause more energy required, and at the same time, the stability of the airflow is insufficient, which will still have a certain impact on the final detection. Therefore, the straight section of the front end can further stabilize the airflow. , because the bending section at the rear end adopts a structure with a gradually reduced diameter, it can increase the field strength in the internal space, gradually enhance the ion focusing ability in the internal space, and at the same time further reduce the size of the outlet, making the final detection result more accurate. The gradually reduced structure can reduce the outlet diameter more than the uniform size structure, and bring better results to the final test results. Among them, the cylindrical structure and conical structure mentioned in this case should also include cross-section and size. Consistent structures and structures of progressively reduced cross-sections and dimensions should not be limited to the literal meaning of this case

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