Time of Flight Mass Spectrometer Particle Limit Selector
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Solution Overview
Problem
Conventional time of flight mass spectrometers face low resolution due to excessive peak broadening during detection of spatial and temporal distribution and initial lateral velocity of species in laser ablation time of flight mass spectrometry, which affects the accuracy of species composition analysis.
Innovation Solution
A mass spectrum resolution device with a particle limit selector that controls lateral velocity and introduces particles into a pulse extraction field, allowing for the separation of ions by time difference in a fieldless drift zone, improving the resolution of time of flight mass spectrometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional time of flight mass spectrometry is used to measure species distribution in laser ablation plasma, then detection sensitivity is high and wide mass range coverage is achieved, but peak broadening is too large and resolution is low
Solution Approach 1:
The drift region is segmented into multiple zones with different electric field strengths. The first drift region has a stronger electric field for faster ion separation, while the second drift region has a weaker field for refined separation, effectively segmenting the separation process to reduce peak broadening and improve resolution
Solution Approach 2:
The electric field strength parameter is changed along the drift path. By varying the electric field strength in different regions (stronger in the first region, weaker in the second), the ion separation process is optimized to achieve better resolution without excessive peak broadening
2Measurement precision
If particle lateral velocity is not limited, then all species in plasma can be detected, but the expansion speed is too high causing large peak broadening and low discrimination
Solution Approach 1:
A velocity selector is placed before the drift region to preliminarily filter particles by their lateral velocity. This preliminary action selects particles with appropriate velocity ranges before they enter the main separation region, preventing excessive peak broadening while maintaining species detection capability
Solution Approach 2:
The velocity selector acts as an intermediary device between the plasma source and the drift region. It mediates the particle flow by filtering out particles with inappropriate lateral velocities, allowing only those with suitable velocities to proceed to the separation region
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 device enhances the mass resolution and provides accurate data on species distribution and plasma evolution, reducing peak broadening and improving the measurement of lateral particle velocity, thereby deepening the understanding of the laser ablation process.
Implementation Method 1
measuring laser ablation ion species with improved time of flight mass spectrometry
Implementation Method 2
The time of flight mass spectrometry uses the velocity separation of ions with different masses under the action of the same accelerating field in fieldless drift to carry out measurements
Implementation Method 3
The time of flight mass spectrometry uses the velocity separation of ions with different masses under the action of the same accelerating field in fieldless drift to carry out measurements
Implementation Method 4
The detection time of particles in the mass spectrum directly corresponds to the mass-to-charge ratios of particles of different species
Data Source
AI summary
A mass spectrum resolution device for measuring laser ablation ion species with improved time of flight mass spectrometry includes a vacuum system unit, a plasma production unit, and a particle restraint selection and separation unit, wherein the particle restraint selection and separation unit comprises a particle limit selector and a plurality of ion pulse accelerated electrode plates; the particle limit selector comprises a restrainer lifting block, a restrainer and a restrainer selection baffle; a through hole is formed in the restrainer lifting block; a plurality of circular holes with different apertures are formed in the restrainer selection baffle, and the restrainer and the restrainer selection baffle are arranged in the restrainer lifting block and can move; and the ion pulse accelerated electrode plates are arranged in the advance direction of particles and are axially parallel to the restrainer lifting block.