Ion Guide Pole Switching for Mass Spectrometry
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Solution Overview
Problem
Conventional mass spectrometry devices face difficulties in rapidly switching the effective number of poles in ion guides, leading to inefficiencies in ion transport and analysis, especially when dealing with a wide range of mass-charge ratios, due to the need for laborious adjustments in high-frequency voltage resonant circuits.
Innovation Solution
An ion guide operation method that uses a voltage generator to produce square wave voltages and a connection switch to rapidly change the grouping of electrodes, allowing the effective number of poles to be adjusted without altering the resonant frequency, enabling efficient ion transport across various mass-charge ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the effective number of poles in the ion guide is changed by adjusting the high-frequency voltage resonant circuit, then the ion guide can adapt to different mass-charge ratio ranges, but the switching process becomes laborious and time-consuming
Solution Approach 1:
The electrode unit is divided into multiple independently controllable electrode groups (first electrode group and second electrode group). By segmenting the electrodes and applying different high-frequency voltages to different groups, the effective number of poles can be changed without complex circuit adjustments. This segmentation enables rapid switching between different pole configurations (e.g., 4-pole, 6-pole, 8-pole) by simply controlling which electrode groups receive voltage, thereby reducing switching time while maintaining adaptability to different mass-charge ratio ranges.
2Reliability
If more electrode groups are used to increase the effective number of poles, then the ion confinement capacity improves, but the device complexity increases
Solution Approach 1:
The ion guide employs a universal electrode configuration where the same physical electrode structure can operate in multiple pole modes (4-pole, 6-pole, 8-pole, etc.) by dynamically assigning different electrode groups to different functional roles. This multi-functionality allows the system to achieve variable ion confinement capacity without requiring physically different electrode structures for each mode, thereby improving reliability across different operating conditions while avoiding the complexity of multiple dedicated electrode sets.
Solution Approach 2:
The electrode groups are dynamically reconfigurable through electronic switching, allowing the effective number of poles to be changed during operation. The connection switch can rapidly connect or disconnect electrode groups from the high-frequency voltage source, enabling dynamic adjustment of the electric field configuration. This dynamic reconfiguration provides flexible ion confinement capacity adaptation without permanent structural changes, balancing reliability and complexity.
3Productivity
If rapid switching of electrode connections is implemented, then the switching time is reduced, but the complexity of the control system increases
Solution Approach 1:
The complex control functionality is extracted into a dedicated connection switch module that handles electrode group configuration independently. This separation allows the main ion guide operation to remain simple while the switching logic is isolated in a specialized component. The connection switch can be controlled by simple digital signals from the control unit, reducing the overall control system complexity while enabling rapid switching between different pole configurations.
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 method allows for nearly real-time switching of the ion guide's effective number of poles, minimizing ion loss and non-sensing time, and enables the use of the same mechanical configuration for ion guides with different numbers of poles, improving analysis efficiency and reducing costs.
Implementation Method 1
high frequency voltages of the same amplitude and frequency but of inverted phase are applied respectively to two rod electrodes adjacent in the circumferential direction about the ion optical axis. When this sort of high frequency voltage is applied to each rod electrode, pseudo-potential barriers are formed by the high frequency electric field generated between the electrodes
Implementation Method 2
pseudo-potential barriers are formed by the high frequency electric field generated between the electrodes, and ions are reflected between these potential barriers as they travel downstream
Implementation Method 3
a connection switch which switches the electrode unit between a first state and a second state; wherein in the first state, the electrodes are grouped in a number 2M of sets, and in the second state, the electrodes are grouped in a number 2L of sets
Implementation Method 4
an ion guide which focuses ions and transports them to a subsequent stage
Implementation Method 5
ions are reflected between these potential barriers as they travel downstream. As a result, ions scattered due to collision with residual gas molecules can also be stably transported
Data Source
AI summary
A method of operating an electrode changeover switch which switches the connection state of electrodes, the electrode changeover switch is provided in the wiring path between eight electrodes through, arranged rotation-symmetrically about ion optical axis, and voltage generation switch which generates square wave high voltage ±V. When switch is switched as shown in the drawing, two circumferentially adjacent rod electrodes are connected to form one set, a square wave voltage of opposite phase is applied to circumferentially adjacent sets, and an effectively quadrupole electric field is formed. When switch is switched, a square wave voltage of opposite phase is applied to circumferentially adjacent rod electrodes and an octupole electric field is formed. In this way, by switching the switch according to the mass range, etc., it becomes possible to rapidly switch the number of poles of a multipole electric field and to suitably transport ions.