Mass Spectrometer Gas Pressure Control
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Solution Overview
Problem
Mass spectrometers face challenges in optimizing gas pressures across different ion optical elements, leading to compromises that affect analysis sensitivity and resolution, particularly for varying types of ions such as small and large molecules, due to conflicting pressure requirements.
Innovation Solution
A mass spectrometer with a controller that adjusts the gas pressure and type in ion optical elements based on the characteristics of the analysis, such as desired resolution or ion type, to optimize signal intensity and resolution, using a rules-based approach and feedback mechanisms to set optimal gas properties for each analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas pressure is increased in the collision cell to improve trapping efficiency, then ion trapping is improved, but signal intensity and resolution in the mass analysis ion trap deteriorate
Solution Approach 1:
The system divides the gas supply into separate controllable segments - each ion trap (collision cell, intermediate storage, mass analysis) has its own independent gas supply line with individual pressure control. This allows each segment to operate at its optimal pressure without affecting others, resolving the contradiction between trapping efficiency and signal quality.
Solution Approach 2:
The gas pressure in each ion trap is made dynamically adjustable rather than fixed. The controller can change pressure settings in real-time based on which ion trap is currently in use, allowing the system to adapt to different operational requirements and eliminate the need for compromise settings.
2Measurement precision
If gas pressure is optimized for small molecule analysis, then sensitivity for small molecules is improved, but sensitivity for large molecules deteriorates
Solution Approach 1:
The gas pressure is made dynamically可调 to match the analysis requirements. When analyzing small molecules, the system sets higher gas pressure for optimal sensitivity. When analyzing large molecules, the system automatically adjusts to lower gas pressure, maintaining sensitivity across different molecular sizes without compromise.
Solution Approach 2:
The system changes the gas pressure parameter based on the type of analysis being performed. Different pressure settings are applied for different ion types and mass ranges, allowing optimal performance across diverse analytical scenarios rather than being locked into a single compromise setting.
Data Source
AI summary
The present disclosure provides a mass spectrometer for performing an analysis of sample ions, and a method for operating a mass spectrometer. The mass spectrometer comprises a first ion optical element that is supplied with a first gas; a mass analyzer, wherein the performance of the mass analyzer is dependent on the pressure of the first gas in the first ion optical element; and a controller for setting a property of the first gas, which comprises at least the pressure of the first gas, on the basis of a characteristic of the analysis to be performed by the mass spectrometer.