Microfabricated Linear Paul-Straubel Ion Trap Array
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Solution Overview
Problem
Current microfabricated mass spectrometers face challenges in achieving high resolution and sensitivity for mass analysis, particularly in miniaturized forms, due to limitations in ion trap design and fabrication, which affects their ability to efficiently trap and detect a wide range of ions from complex samples.
Innovation Solution
A microfabricated linear Paul-Straubel ion trap array is developed, featuring a planar design with parallel RF and DC electrodes, allowing for efficient ion trapping and ejection, and scalable fabrication techniques to enhance sensitivity and resolution, suitable for mass spectrometry applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional ion trap designs are used in microfabricated mass spectrometers, then fabrication is simpler, but ion trapping capacity and sensitivity are reduced
Solution Approach 1:
The patent transitions from conventional three-dimensional ion trap geometries to a planar two-dimensional configuration. The ion trap electrodes are arranged in a planar array with parallel RF and DC control electrodes, creating an RF quadrupole electric field potential well in a plane rather than in three-dimensional space. This dimensional reduction enables microfabrication compatibility while maintaining effective ion trapping capacity.
Solution Approach 2:
The ion trap is divided into multiple parallel electrode pairs (RF and DC control electrodes) arranged in a segmented array configuration. Each electrode pair contributes to the overall electric field, and the segmented structure allows for scalable fabrication while increasing the total ion trapping capacity through multiple trapping zones.
2Volume of moving object
If miniaturized ion traps are used, then device size is reduced, but resolution and sensitivity deteriorate
Solution Approach 1:
The patent optimizes the electrical parameters of the ion trap, specifically the RF voltage amplitude and frequency applied to the parallel electrodes. By carefully controlling these parameters, the RF quadrupole electric field creates a potential well with appropriate depth and confinement strength, enabling high-resolution mass analysis in a miniaturized planar configuration. The DC control electrode voltages are also adjusted to fine-tune the trapping potential.
3Use of energy by moving object
If conventional three-dimensional ion trap geometries are used, then ion trapping depth is sufficient, but fabrication complexity and power requirements increase
Solution Approach 1:
The patent replaces conventional three-dimensional mechanical electrode structures with a planar electrode array configuration. This substitution reduces the physical volume and power requirements while maintaining ion trapping depth through optimized electric field geometry. The planar structure requires lower RF drive powers compared to conventional 3D traps of equivalent trapping capacity.
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
The microfabricated linear Paul-Straubel ion trap array provides improved ion trapping capacity and sensitivity, enabling effective detection of a broad mass range with reduced size and power requirements, suitable for portable chemical analysis systems.
Implementation Method 1
an RF quadrupole electric field potential well is established on a trap axis in the plane between the RF electrodes when a radiofrequency potential is applied to the RF electrodes
Implementation Method 2
two parallel inner RF electrodes disposed on the dielectric layer and suspended over the opening in the substrate, wherein an RF quadrupole electric field potential well is established on a trap axis
Implementation Method 3
two parallel outer DC control electrodes deposed on opposite sides of the two parallel inner RF electrodes and symmetrically about the trap axis in the plane of the RF electrodes
Data Source
AI summary
An array of microfabricated linear Paul-Straubel ion traps can be used for mass spectrometric applications. Each ion trap comprises two parallel inner RF electrodes and two parallel outer DC control electrodes symmetric about a central trap axis and suspended over an opening in a substrate. Neighboring ion traps in the array can share a common outer DC control electrode. The ions confined transversely by an RF quadrupole electric field potential well on the ion trap axis. The array can trap a wide array of ions.