ion guide

Abstract

The invention provides an ion guide device. The ion guide device consists of multiple layers of filament electrodes stretched straightly and intersected spatially, wherein the filament electrodes are distributed along a guide shaft for defining an ion guide direction; each layer of filament electrode comprises at least two filaments which are stretched straightly and have certain distance away from the guide shaft; and each layer of filament electrode rotates around the guide shaft by a certain angle relative to the adjacent layer of filament electrode, so that the multiple layers of filament electrodes surround the guide shaft to form a through cage-like ion guide channel; and frames for fixing the filaments are arranged at the periphery of the channel, so interference of the device on air flow is reduced. A power supply device provides voltage for each layer of filament electrode to at least construct an electric field for converging ions to the guide shaft.

Description

Technical field [0001] The invention relates to an ion guide device, in particular to an ion guide device that introduces ions into a lower pressure environment for mass spectrometry analysis in a higher pressure (or lower vacuum) environment. Background technique [0002] In a mass spectrometer, in order to be at a higher pressure (1~10 4 Pa) The ions are guided from the ion source to the analyzer, usually using a high-frequency (or radio frequency) guiding device. The effective potential barrier formed by the high-frequency voltage applied to the electrode in the device causes the ions to accelerate to the central axis, thereby acting A convergent effect. Due to the collision with the neutral gas, the kinetic energy of the ions is lost, and the ions are gathered near the central axis, smoothly pass through the differential suction hole, and enter the mass spectrometer in a lower atmospheric pressure environment. This kind of radio frequency convergent guiding device ranges fro...

AI Technical Summary

Problems solved by technology

However, the silk screen is generally soft in texture, and the inventor has not given a plan on how to firmly install it in a specific position in the space without being blown by the airflow.

If you install it with an additional bracket, the additional bracket will also affect the direction of the airflow

[0004] Moreover, in various ion guide devices in the past, adjacent electrodes to which high-frequency voltages of different phases are applied are either parallel to each other (between lines or between surfaces), or are in the shape of concentric arcs, and the capacitance between electrodes is relatively large.

For example, the ion funnel proposed by U.S. Patent 6107628 uses sheet electrodes with opposite polarities. Due to the stacking of multiple groups, the total capacitance of the electrode structure is relatively large, which increases the power consumption of the power supply that provides high-frequency voltage.

[0005] In addition, there are many such electrodes arranged together, which are connected in parallel for the high-frequency power supply, and the large total capacitance increases the power consumption of the high-frequency power supply.

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