MPIG Electrode Parabolic Field Ion Trapping
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Solution Overview
Problem
Current mass spectrometry instruments, particularly ion trap technologies, face limitations in dynamic range due to ion repulsion and high costs, which restrict their ability to analyze a wide range of molecules and perform complex structural studies, especially in portable and miniaturized forms.
Innovation Solution
The development of a mass spectrometer system utilizing a multi-potential ion guide (MPIG) electrode with a chemically modified, semi-conductive polymer coating to create a parabolic electric field, allowing for efficient ion trapping and analysis without the need for complex shaped electrodes, enabling miniaturization and cost-effective production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If expensive high field super conducting magnets and specialized shaped electrodes are used in ion trap instruments, then mass analysis capability is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces complex mechanical/magnetic field systems (super conducting magnets) with a simpler electrostatic field system using a wire electrode and end cap electrodes. The wire electrode generates an electrostatic field that provides mass-dependent ion trapping without requiring expensive magnetic components, thereby reducing device complexity while maintaining mass analysis capability.
Solution Approach 2:
The patent extracts the essential function of mass-dependent ion trapping from the complex magnetic field system and implements it through a simplified electrostatic field configuration. By removing the super conducting magnets and specialized shaped electrodes, the invention retains the core mass analysis capability with significantly reduced complexity.
2Measurement precision
If specialized shaped electrodes are used to create homogeneous fields, then mass analysis precision is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent creates a homogeneous electrostatic field using simple geometric components (wire electrode and end cap electrodes) rather than complex specialized shaped electrodes. The cylindrical geometry with coaxial wire electrode produces a naturally homogeneous field in the radial direction, eliminating the need for difficult-to-manufacture specialized electrode shapes.
Solution Approach 2:
The patent changes the approach from shaping electrodes to achieve homogeneity to using simple electrode geometries with controlled voltage parameters. By adjusting the voltage applied to the wire electrode and end cap electrodes, the system achieves the required field homogeneity without complex electrode manufacturing.
3Device complexity
If a limited area of homogeneity is used in ion traps, then device complexity is reduced, but dynamic range is limited due to space charge repulsion
Solution Approach 1:
The patent segments the ion trapping function across multiple electrodes (wire electrode and multiple end cap electrodes) to create an extended homogeneous field region. This segmentation allows a larger volume for ion storage while maintaining field homogeneity, thereby increasing the number of ions that can be trapped before space charge repulsion becomes problematic and expanding the dynamic range.
4Reliability
If complex shaped electrodes are used for ion trapping, then ion trapping efficiency is improved, but device cost and complexity increase
Solution Approach 1:
The patent replaces complex mechanically shaped electrodes with simple geometric electrodes that generate an electrostatic field. The wire electrode with cylindrical geometry and end cap electrodes create sufficient ion trapping efficiency through the electrostatic field alone, eliminating the need for complex electrode shaping while maintaining reliable ion confinement.
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 approach enables efficient ion trapping and analysis, allowing for long-term storage of molecules, performing complex structural studies, and expanding the dynamic range while reducing costs, making it suitable for portable and miniaturized applications.
Implementation Method 1
The electric field generated by the wire electrode effectively trapped ions in a potential well relative to the reference potential generated by the outer cylinder electrode
Implementation Method 2
When a negative voltage was placed on the center wire electrode relative to the outer cylinder, a potential field was formed that attracted positive charged ions towards the wire electrode
Implementation Method 3
a potential field was formed that attracted positive charged ions towards the wire electrode
Implementation Method 4
The angular velocity of the ions would cause the particles to orbit the EPG, effectively trapping them in the radial direction
Implementation Method 5
The addition of positively charged electrostatic electrodes placed at the ends of the cylinder electrode would create an orthogonal potential well that would trap the ions in the axial direction creating an effective ion trap
Data Source
AI summary
In one aspect of the invention, an ion trap mass analyzer includes a variable- or multi-potential type ion guide (MPIG) assembly which has been pre-configured to produce a parabolic-type potential field. Each MPIG electrode has a resistive coating of designed characteristics. In one example the coating varies in thickness long the length of an underlying uniform substrate. The MPIG assembly can be a single MPIG electrode or an array of a plurality of MPIG electrodes. An array can facilitate delocalization for improved performance. This chemical modification of a uniform underlying substrate promotes cheaper and flexible instruments. The modified MPIG electrodes also allow miniaturization (e.g. micro and perhaps even nano-scale), which allows miniaturization of the instrument in which the single or plural modified MPIG electrode(s) are placed. This promotes portability and field use instead of limitation to laboratory settings.