Method for enhancing grid ion trap performance
An ion trap and grid technology, which is used in electron/ion optical devices, parts of particle separator tubes, particle separation tubes, etc., can solve problems such as reduction and strong field defects, and achieve improved mass spectrometry performance and mass spectrometry performance. , the effect of reducing the difficulty of processing
Active Publication Date: 2016-06-01
FUDAN UNIV +1
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[0008] Although the grid part in the above invention makes up for the field defect, due to reasons such as the grid structure, position and electrode structure, there are still strong field defects in the well, resulting in a decrease in mass spectrometry performance, such as mass resolution.
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[0028] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0029] In the technical solution, in the grid ion trap, RF voltage is respectively applied to the grid and the corresponding electrodes, and the electric field distribution in the ion trap is improved by adjusting the amplitude ratio of the two, thereby improving the performance of mass spectrometry. figure 1 It is one of the embodiments of the invention, a schematic diagram of applying a sinusoidal high-frequency voltage to the grid and the electrodes respectively. The ion trap in the figure is a linear ion trap loaded with a grid, which is composed of six electrodes, and a pair of electrodes 11 and 12 are applied with a DC voltage in the axial direction to form a DC potential well to confine the ions. The radial four electrodes 13, Apply radio frequency voltage to 14, 15 and 16 to form a quadrupole electric field in the radial direction, and...
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The invention belongs to the technical field of mass analysis instruments, and particularly provides a method for enhancing grid ion trap performance. A grid ion trap comprises a three-dimensional ion trap or a linear ion trap of which at least one electrode is loaded with a grid. The conductive grids and the electrodes are electrically insulated from each other in the electrodes loaded with the grids so that radio frequency voltage can be respectively applied to the grids and the electrodes. Electric field distribution of the ion trap is changed by adjusting the ratio of voltage applied to the grids and the electrodes so that great mass spectrometry performance can be achieved. Advantages of high ion pop-up efficiency and simple processing of the grid electrodes can be maintained simultaneously. The method for enhancing grid ion trap performance can be used for ion storage, mass analysis and tandem mass spectrometry.
Description
technical field [0001] The invention belongs to the technical field of mass analysis instruments, and in particular relates to a method for improving the performance of a grid ion trap. Background technique [0002] Mass spectrometers can perform accurate qualitative and quantitative analysis of substances, and have high sensitivity and selectivity. They have been widely used in chemistry, biology, medicine, food safety, environmental protection, aerospace and other fields. Quadrupole ion traps can be used to store ions, mass analysis and tandem mass spectrometry, and play a very important role in mass spectrometers. [0003] There are two types of quadrupole ion traps, three-dimensional ion traps and two-dimensional ion traps. A three-dimensional ion trap is formed by a ring electrode and two end cap electrodes. Generally, a radio frequency voltage is applied to the ring electrode, and the end cap electrodes are grounded to confine ions near the center of the trap. The tw...
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IPC IPC(8): H01J49/06H01J49/42
CPCH01J49/061H01J49/42
Inventor 党乾坤黄彦东丁航宇丁传凡周振黄正旭高伟粘慧青
Owner FUDAN UNIV