Dual-Mode Electrostatic Lens for Ion Beam Transmission and Reflection
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Solution Overview
Problem
Current mass spectrometry techniques face limitations in achieving high precision and accuracy due to elemental and molecular interferences, particularly in isobaric interferences where high mass resolution is required, which often results in reduced sensitivity and analytical precision.
Innovation Solution
A dual-function electrostatic lens assembly that selectively transmits or reflects an ion beam in a mass spectrometer, allowing for switchable operation between transmission and reflection modes to enhance ion beam focusing and reduce divergence, thereby improving the ability to separate interfering species without the need for high mass resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high mass resolution is used to separate interfering species, then measurement precision is improved, but sensitivity deteriorates due to reduced transmission
Solution Approach 1:
The ion beam path is segmented into multiple trajectories using electrostatic mirrors, allowing separate optimization for different mass ranges. High-resolution analysis and full-transmission analysis occur along different paths, eliminating the need to compromise either parameter in a single path.
Solution Approach 2:
The patent adds a spatial dimension to the mass analysis by creating multiple beam paths (direct path and reflected path) through electrostatic mirrors. This allows the system to achieve high resolution for specific masses while maintaining full transmission for others, effectively adding a path-dimension to the traditional single-path mass analyzer.
2Measurement precision
If high mass resolution is achieved through narrow entrance slits, then measurement precision is improved, but device complexity and sensitivity are worsened
Solution Approach 1:
The patent replaces mechanical slit adjustments with electrostatic field control. Instead of physically narrowing slits to achieve resolution, electrostatic mirrors deflect specific ion trajectories, achieving mass resolution through field-based trajectory separation rather than mechanical aperture restriction.
3Measurement precision
If extended physical and chemical sample preparation is applied to remove interferences, then measurement precision is improved, but device complexity and analysis time are worsened
Solution Approach 1:
The patent extracts the interference removal function from the sample preparation stage and relocates it to the mass analysis stage. Electrostatic mirrors selectively deflect interfering ion trajectories away from the detection path, achieving interference rejection without requiring complex chemical separation procedures upstream.
Solution Approach 2:
The system changes the operational parameters of the mass analyzer dynamically, switching between high-resolution mode (with mirror deflection) and full-transmission mode (without deflection) depending on the analytical requirements. This allows precision and sensitivity to be optimized for different measurement scenarios without physical reconfiguration.
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 solution enables increased sensitivity and precise analysis by allowing for full sample flow within a single instrument, reducing complexity and cost, while maintaining high precision in isotope ratio measurements and elemental composition analysis.
Implementation Method 1
A dual-function electrostatic lens assembly that selectively transmits or reflects an ion beam in a mass spectrometer
Implementation Method 2
The invention relates to an electrostatic lens, in particular a lens for use with a mass spectrometer
Implementation Method 3
allowing for switchable operation between transmission and reflection modes to enhance ion beam focusing and reduce divergence
Data Source
AI summary
An electrostatic dual-mode lens assembly is provided for selectively transmitting or reflecting an ion beam in a mass spectrometer. The assembly comprises at least one electrode that provides a switchable electric field that, during a first mode of operation, directs an ion beam that enters the assembly along a first path so that the beam is transmitted through the assembly along the first path, and during a second mode of operation, directs an ion beam that enters the assembly along the first path so that the ion beam is reflected by the electric field and exits the assembly along a second path. Methods for operating a mass spectrometer using an electrostatic lens are also provided.