Photoionization ion source with compact structure and photoionization time-of-flight mass spectrometer

Abstract

The invention belongs to the technical field of analytical instruments, and particularly relates to a photoionization ion source with a compact structure and a photoionization time-of-flight mass spectrometer. The photoionization ion source comprises an ultraviolet lamp and an electrode group which are arranged in sequence, wherein an insulating sealing ring is arranged between adjacent electrodes in the electrode group, the middle of each electrode in the electrode group is provided with a through hole structure, and the insulating sealing rings and the electrodes in the electrode group jointly form a columnar cavity; and the electrodes in the electrode group comprise a drifting head electrode, at least one drifting electrode and a drifting tail electrode which are arranged in sequence, a capillary tube for sample introduction is arranged on the side surface of the drifting head electrode, and the ultraviolet lamp is arranged at one end, close to the drifting head electrode, in the columnar cavity. When the photoionization ion source is applied to the time-of-flight mass spectrometer, the structure of the time-of-flight mass spectrometer can be effectively simplified, the size of the time-of-flight mass spectrometer is reduced, the energy consumption of the time-of-flight mass spectrometer is reduced, the popularization and the use of the time-of-flight mass spectrometer are facilitated, and thus the application prospect is good.

Description

technical field [0001] The invention belongs to the technical field of analytical instruments, and in particular relates to a compact photoionization ion source and a photoionization time-of-flight mass spectrometer. Background technique [0002] Time of Flight Mass Spectrometer (TOF) is a commonly used mass spectrometer. The mass analyzer of this mass spectrometer is an ion drift tube. The sample is processed into an ion beam by the ion source, and the ion beam enters the field-free drift tube after acceleration, and flies to the ion receiver at a constant speed. The larger the ion mass, the longer it takes to reach the receiver, and the smaller the ion mass, the shorter the time it takes to reach the receiver. According to this principle, ions of different masses can be separated according to the m / z value, and then the samples are analyzed. of ions. [0003] In TOF, the ion source is a very important component. The ionization effect of the ion source on the sample is ...

AI Technical Summary

Problems solved by technology

In addition to the ionization region of the ion source, there are usually other regions in the TOF that need to maintain vacuum, such as the ion transmission region. Therefore, the existing photoionization time-of-flight mass spectrometers usually have multiple mechanical pumps or molecular vacuum pumps for vacuuming. Pump, which makes the structure of the instrument complex, bulky, and high energy consumption during use, which is not conducive to its popularization and application

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