Binary Gas Mixture Ion Selection in Mass Spectrometry
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Solution Overview
Problem
Mass spectrometry systems face challenges in selectively identifying analyte ions while suppressing interfering ions, particularly when the interfering ions have similar mass-to-charge ratios to the analyte ions, leading to reduced detection sensitivity and accuracy.
Innovation Solution
A multimode cell system using a binary gas mixture in both collision and reaction modes, where the gas mixture collides with the ion stream to differentiate between analyte and interfering ions based on kinetic energy loss, allowing for efficient mass filtering and suppression of interfering ions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single gas type is used in the cell, then the system operation is simple, but the ability to selectively suppress interfering ions with similar mass-to-charge ratios is insufficient
Solution Approach 1:
The patent uses a composite gas mixture comprising a first gas (e.g., helium) and a second gas (e.g., hydrogen or nitrogen) in specific proportions. This composite gas mixture enables simultaneous collisional cooling and kinetic energy discrimination, allowing selective suppression of interfering ions while transmitting analyte ions, thereby resolving the contradiction between detection sensitivity and gas composition complexity.
Solution Approach 2:
The patent optimizes specific parameters of the gas mixture including the type of gases used, their proportion ratios (e.g., 95:5, 90:10), and the resulting cell pressure. By changing these parameters, the system achieves enhanced ability to discriminate between analyte ions and interfering ions based on their different kinetic energy loss characteristics during collisions, improving detection sensitivity without excessive complexity.
2Adaptability or versatility
If a binary gas mixture is used in both collision and reaction modes, then the ion selection capability is enhanced, but the gas delivery system complexity increases
Solution Approach 1:
The patent makes the binary gas mixture universal for both collision mode and reaction mode operation. The same gas mixture composition serves dual purposes: providing collisional cooling and kinetic energy discrimination in collision mode, and enabling chemical reactions with interfering ions in reaction mode. This eliminates the need for separate gas delivery systems for different modes, reducing overall system complexity while maintaining versatility.
Solution Approach 2:
The patent merges the gas delivery requirements for collision mode and reaction mode into a single unified gas delivery system. By combining the functions of both modes into one gas mixture delivery pathway, the system reduces the number of gas inlet lines, valves, and control mechanisms needed, thereby simplifying the gas delivery system while maintaining the ability to switch between operational modes.
3Measurement precision
If different gas mixtures are used for collision and reaction modes, then each mode can be optimized, but the gas switching time and system complexity increase
Solution Approach 1:
The patent employs a universal binary gas mixture that functions effectively in both collision mode and reaction mode without requiring gas composition changes. This single gas mixture can be optimized to provide both collisional cooling and kinetic energy discrimination capabilities, as well as chemical reactivity with interfering ions, thereby eliminating gas switching operations and reducing transition time between modes while maintaining ion selection accuracy.
Solution Approach 2:
The patent ensures continuous useful action by maintaining the same binary gas mixture composition throughout both collision and reaction modes. This continuity eliminates interruptions caused by gas switching, allowing the system to transition smoothly between operational modes without loss of analytical time, while the binary mixture continues to provide effective ion selection and interference suppression throughout.
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 system effectively enhances the detection sensitivity by selectively transmitting analyte ions while eliminating interfering ions, improving the detection limits and accuracy of mass spectrometry analysis.
Implementation Method 1
the gas mixture collides with the ion stream to differentiate between analyte and interfering ions based on kinetic energy loss
Implementation Method 2
provide a voltage to the pressurized cell comprising the gas mixture in the collision mode to facilitate the transmission of select ions with an energy greater than an energy barrier induced by the provided first voltage
Implementation Method 3
provide a second voltage to the pressurized cell comprising the gas mixture in the reaction mode to guide select ions into a mass filter fluidically coupled to the cell
Implementation Method 4
guiding select ions into a mass filter fluidically coupled to the cell
Data Source
AI summary
Certain configurations described herein are directed to mass spectrometer systems that can use a gas mixture to select and/or detect ions. In some instances, the gas mixture can be used in both a collision mode and in a reaction mode to provide improved detection limits using the same gas mixture.