Electrode Structure for Electrostatic Orbital Trap Mass Spectrometer
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Solution Overview
Problem
Conventional electrostatic orbital trap mass spectrometers face issues with ion phase spread and loss of coherent motion due to non-ideal electric field approximations, leading to reduced mass resolution and accuracy, which existing solutions attempt to address through complex electrode modifications that introduce perturbations or compromise the simplicity of the ideal quadro-logarithmic electric field.
Innovation Solution
The design incorporates an electrode structure that closely approximates the ideal quadro-logarithmic electric potential by using a natural gap between inner and outer potential canyons for ion injection, maintaining the simplicity of the ideal electric field without introducing perturbations, and utilizing additional electrodes to compensate for radial truncation effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional electrostatic orbital trap mass spectrometers use non-ideal electric field approximations for ion trapping, then device complexity is reduced and manufacturing is simplified, but ion phase spread increases and coherent motion is lost, leading to reduced mass resolution and accuracy
Solution Approach 1:
The outer electrode is divided into two separate halves that can be independently positioned and adjusted. This segmentation allows each electrode half to be optimized for maintaining the ideal quadro-logarithmic electric field potential while providing practical access for ion injection and detection, thereby improving mass resolution without excessive complexity
Solution Approach 2:
A natural gap is introduced between the inner and outer potential canyons to serve as an intermediary region for ion injection. This gap allows ions to enter the trapping region without disrupting the ideal electric field configuration, maintaining both measurement precision and practical operability
2Measurement precision
If complex electrode modifications are introduced to address ion phase spread, then mass resolution may be improved, but the simplicity of the ideal quadro-logarithmic electric field is compromised and device complexity increases
Solution Approach 1:
The electrode surfaces are precisely shaped to follow equipotential lines of the ideal quadro-logarithmic electric potential. By maintaining equipotential surfaces, the electric field configuration remains ideal and simple, while ion phase spread is minimized, achieving both mass accuracy and ease of operation
Solution Approach 2:
The electrode surfaces extend slightly beyond the minimum required region, providing excess electrode material that can be precisely shaped to maintain ideal field conditions. This excessive action ensures that the electric field remains purely quadro-logarithmic without requiring complex modifications, preserving both accuracy and simplicity
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 enhances ion trapping and mass resolution by maintaining the coherence of ion motion and stability within the trap, allowing for wider acceptable ion beam parameters and improved sensitivity without altering the ideal electrode structure, thus addressing the limitations of previous designs.
Implementation Method 1
an electrode structure defining an internal volume of the trap with at least some of electrode surfaces shaped to substantially follow equipotential lines of an ideal quadro-logarithmic electric potential
Implementation Method 2
a trapping voltage supply which provides trapping voltages on the electrodes to generate a trapping electrostatic potential within the internal volume of the trap
Implementation Method 3
The ideal electric potential has an inner potential canyon, an outer potential canyon, and a low potential passage therebetween. The approximated part of the ideal electric potential includes the low potential passage between the inner and outer potential canyons
Implementation Method 4
the motion of an ion having mass m and electric charge q along the axis z in the trapping quadro-logarithmic field is a simple harmonic oscillation near the plane z=0: z(t)=Az cos(ωt+θ)
Data Source
AI summary
An orbital ion trap for electrostatic field ion trapping which includes an electrode structure defining an internal volume of the trap with at least some of electrode surfaces shaped to substantially follow equipotential lines of an ideal quadro-logarithmic electric potential around a longitudinal axis z. The ideal electric potential has an inner potential canyon, an outer potential canyon, and a low potential passage therebetween. The trap includes a trapping voltage supply which provides trapping voltages on the electrodes to generate a trapping electrostatic potential within the internal volume of the trap. The trapping electrostatic potential closely approximates at least a part of the ideal electric potential in at least a part of the internal volume of the trap.