Hydrogen Buffer Gas in Portable Ion Trap Mass Spectrometers
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Solution Overview
Problem
Quadrupole ion trap mass spectrometers rely on heavy helium gas cylinders for buffer gas, which are cumbersome and restricted for transportation, especially by air, while alternatives like air as a buffer gas reduce mass resolution and fragmentation efficiency.
Innovation Solution
A system using a hydrogen gas generator, such as a metal hydride container or electrolysis-based unit, to supply hydrogen molecules as a buffer gas, maintaining performance similar to helium without the need for compressed gas cylinders, enabling portable and air-transportable mass spectrometry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If helium gas cylinders are used as buffer gas source, then mass resolution and fragmentation efficiency are maintained at high levels, but the system becomes heavy and difficult to transport especially by air
Solution Approach 1:
The patent extracts the buffer gas function from heavy compressed helium cylinders and implements it through a lightweight hydrogen generation system. A hydrogen gas generator (electrolysis cell or metal hydride container) replaces the traditional helium cylinder, providing the necessary buffer gas (hydrogen) for ion cooling and fragmentation while dramatically reducing system weight and eliminating transportation restrictions.
Solution Approach 2:
The patent changes the buffer gas parameter from helium to hydrogen. Hydrogen has similar molecular weight (2 Da vs 4 Da) providing comparable ion cooling efficiency and mass resolution, while being significantly lighter when stored in generation devices rather than compressed cylinders. This parameter change maintains analytical performance while solving the portability issue.
2Ease of operation
If air is used as buffer gas to replace helium, then transportation restrictions are eliminated, but mass resolution and fragmentation efficiency severely decrease
Solution Approach 1:
The patent introduces hydrogen as an intermediary buffer gas that mediates between the conflicting requirements of portability and performance. Hydrogen serves as the collision partner for ion cooling and fragmentation, providing performance similar to helium while being generated on-site from lightweight devices. This intermediary solution avoids both the weight penalty of helium cylinders and the performance penalty of using air.
3Reliability
If heavy compressed gas cylinders are used for helium storage, then reliable buffer gas supply is ensured, but the system complexity and transportation restrictions increase
Solution Approach 1:
The patent implements a self-service buffer gas supply system where the instrument generates its own hydrogen buffer gas on-demand through electrolysis of water or decomposition of metal hydrides. This eliminates the need for external compressed gas cylinders, their associated safety regulations, and transportation restrictions, while maintaining reliable buffer gas supply through integrated generation devices that can operate continuously.
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 achieves comparable mass resolution and fragmentation efficiency to helium-based systems while eliminating the need for heavy gas cylinders, enhancing the portability and transportability of quadrupole ion trap mass spectrometers.
Implementation Method 1
portable ion trap mass spectrometer with metal hydride container as source of hydrogen buffer gas
Implementation Method 2
cooling at least part of the ions inside the quadrupole ion trap cell using the hydrogen molecules as a buffer gas
Implementation Method 3
The buffer gas molecules have another function in tandem MS (MSn) experiments where these molecules serve as a collisional partner to break down (to fragment) ions into product (fragment) ions
Data Source
AI summary
A mass spectrometry (MS) method which includes generating in a vicinity of the quadrupole ion trap hydrogen molecules, directing at least part of the hydrogen molecules into the quadrupole ion trap cell, applying AC and DC voltages to quadrupole ion trap cell electrodes to create a combined AC/DC trapping field, placing sample ions inside the quadrupole ion trap cell, cooling at least part of said ions using said hydrogen molecules as a buffer gas, changing the combined AC/DC trapping field to eject the ions from the quadrupole ion trap cell, and detecting the ejected ions.