Ion Trap Temporal Gating for Mass Spectrometer Interference Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional mass spectrometer systems face challenges in efficiently separating ionized and neutral molecules, leading to increased interference and the need for large, costly vacuum pumps, which complicates the system and reduces portability and sensitivity.
Innovation Solution
The system employs a sample injection device and ion trap that ionizes samples while allowing neutral molecules to migrate out, separating ionized molecules from neutral molecules in time and space, allowing for reduced vacuum pumping requirements and enhanced detector sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If vacuum pumps are used to remove neutral molecules from the pressure wave, then the level of interference detections is decreased, but the size, weight, and cost of the MS system increase
Solution Approach 1:
The system divides the pressure wave into two separate temporal components: ionized molecules are detected first during an initial time window, while neutral molecules are excluded during a subsequent time window. This temporal segmentation allows the detector to process ions without interference from neutrals, eliminating the need for large vacuum pumps to physically separate the molecules spatially.
Solution Approach 2:
The detector operates in periodic cycles, alternating between an acquisition mode where ionized molecules are detected and a exclusion mode where neutral molecules are filtered out. This periodic temporal gating allows the system to achieve high signal-to-noise ratios using minimal vacuum pumping, thereby reducing system weight and complexity.
2Reliability
If vacuum pumps are used to maintain low pressure in the MS system, then the service life of the system is extended, but the portability of the system decreases
Solution Approach 1:
The system employs periodic temporal gating to allow neutral molecules to pass through the detector during exclusion windows while maintaining acceptable pressure levels. This approach extends system service life by preventing pressure buildup without requiring large, non-portable vacuum pumps, thereby preserving portability.
3Weight of stationary object
If the size of vacuum pumps is decreased, then the portability of the system is improved, but the number of neutral molecules removed decreases
Solution Approach 1:
The system uses periodic temporal gating to separate ionized and neutral molecule detection in time. During acquisition windows, ions are detected; during exclusion windows, neutrals are blocked. This temporal separation allows small vacuum pumps to maintain adequate pressure without needing to remove large numbers of neutral molecules continuously, thus preserving portability while maintaining detection productivity.
4Device complexity
If neutral molecules are not removed from the pressure wave, then the system complexity is reduced, but the detector sensitivity decreases
Solution Approach 1:
The system implements periodic temporal gating that alternates between acquisition mode (detecting ionized molecules with high sensitivity) and exclusion mode (blocking neutral molecules to prevent interference). This approach maintains detector sensitivity without requiring complex physical separation mechanisms, thereby reducing overall system complexity while preserving measurement precision.
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 the detection of materials of interest by reducing interference, extending detector service life, and minimizing system size, weight, and cost by separating ionized and neutral molecules, enabling more efficient operation with smaller vacuum pumps.
Implementation Method 1
an ion source configured to ionize a sample injected into the ion trap such that a plurality of ionized molecules is generated within the ion trap
Implementation Method 2
The ion trap is configured to maintain the plurality of ionized molecules therein while a plurality of neutral molecules migrate out of the ion trap
Data Source
AI summary
A mass spectrometer system includes a sample injection device defining a sample injection aperture. The system also includes an ion trap defining an ion outlet aperture. The ion trap is coupled to the sample injection device. The system further includes a detector positioned downstream of the ion outlet aperture. The system also includes an ion source coupled to the ion trap. The ion source is configured to ionize a sample injected into the ion trap and generate a plurality of ionized molecules within the ion trap. The ion trap is configured to maintain the plurality of ionized molecules therein while a plurality of neutral molecules migrate out of the ion trap until a predetermined pressure is attained in the ion trap.