Rectangular Ion Trap Electrode Configuration for Enhanced Storage
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Solution Overview
Problem
The existing rectangular ion trap devices face challenges in efficiently storing ions during the ion injection storage phase, leading to a high number of ions being drawn out, which affects detection efficiency, especially for low-abundance ions in complex samples, due to suboptimal buffer gas levels impacting vacuum quality and ion separation.
Innovation Solution
A new type of rectangular ion trap device with specific front and rear end cover configurations, including electrodes and insulators, adjusts voltages to attract and retain ions, reducing kinetic energy and preventing ion escape, thereby enhancing ion storage and separation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If buffer gas flow rate is increased to store more ions, then ion storage capacity is improved, but vacuum degree deteriorates and affects ion separation detection
Solution Approach 1:
The patent implements dynamic control of buffer gas flow rate based on operational phase. During ion injection storage phase, buffer gas flow is increased to enhance ion storage capacity. During ion separation detection phase, buffer gas flow is reduced to maintain vacuum degree. This dynamic adjustment resolves the contradiction between ion storage capacity and vacuum quality by adapting gas flow to operational requirements.
Solution Approach 2:
The patent changes the parameter of buffer gas flow rate according to operational phase. By adjusting this critical parameter, the system optimizes ion storage during injection phase while preserving vacuum quality during detection phase, thereby resolving the fundamental contradiction between these two requirements.
2Object-affected harmful factors
If buffer gas flow rate is decreased to maintain vacuum quality, then ion separation detection is improved, but ion storage capacity deteriorates
Solution Approach 1:
The system dynamically adjusts buffer gas flow rate based on operational phase. During ion separation detection phase, buffer gas flow is decreased to maintain high vacuum quality for optimal detection performance. During ion injection storage phase, buffer gas flow is increased to compensate for reduced storage capacity, ensuring sufficient ion accumulation. This temporal separation of optimization goals resolves the contradiction.
3Speed
If ions are allowed to move at high speed for rapid detection, then detection speed is improved, but ion loss increases due to kinetic energy
Solution Approach 1:
The patent employs periodic modulation of radio frequency electrical field to control ion motion. Ions are trapped and accumulated during storage phase, then selectively ejected during detection phase through periodic field changes. This periodic action allows ions to remain stationary (low speed) during storage to prevent loss, then move rapidly during detection to enable fast analysis, resolving the speed-retention contradiction.
Solution Approach 2:
The system changes the parameter of radio frequency field strength and phase to control ion kinetic energy. During storage, parameters are set to minimize ion motion and retain ions. During detection, parameters are adjusted to increase ion speed for rapid ejection and detection. This parameter modulation resolves the contradiction between ion retention and detection speed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly increases ion storage within a unit time, improves signal intensity, and enhances mass resolution, facilitating better detection of low-abundance ions in complex samples by concentrating ion clouds and maintaining vacuum integrity.
Implementation Method 1
the front end cover is negatively charged to attract the ion with positive charge, so that the ion with positive charge enters the ion trap
Implementation Method 2
the rear end cover (in this stage the rear end cover is positively charged) repels the ion with positive charge to a center of the ion trap
Implementation Method 3
buffer gas is generally injected into the ion trap and used to impact the ion with positive charge so as to reduce the kinetic energy of the ion with positive charge
Implementation Method 4
moves at a high speed under the effect of a radio frequency electrical field
Data Source
AI summary
The present invention discloses a rectangular ion trap device and method for ion storage. The device comprises a front end cover including left electrode, middle layer insulator, and right electrode, wherein the left electrode and the right electrode are respectively positioned at both sides of the middle layer insulator; a rear end cover, wherein the rear end cover has the same axis as the front end cover, and the central position of the rear end cover electrode is penetrated; the front and rear electrodes and the upper and lower electrodes are symmetric along the axis of the front end cover, and these electrodes form a space region for ion storage about the axis between the front end cover and the rear end cover electrode. The present invention can increase the number of ions in storage within a unit time prominently.