Sample Introduction Member for Mass Spectrometry Vacuum Efficiency
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Solution Overview
Problem
Mass spectrometry systems face inefficiencies in sample introduction from ambient environments due to the small size of MS inlets, which hampers direct sampling and reduces sensitivity, especially in miniature systems.
Innovation Solution
The development of sample introduction members with specific configurations, such as tubes with bent portions and heating elements, that capture and transfer neutral molecules or ions from a sample surface to a mass spectrometer, enhancing the efficiency of sample introduction and sensitivity through laminar flow and gas flow assistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MS inlet size is reduced to maintain vacuum, then the vacuum maintenance is improved, but the sample intake efficiency deteriorates
Solution Approach 1:
A carrier gas is introduced as an intermediary substance that transports neutral molecules from the ambient environment through the small MS inlet into the vacuum chamber. The carrier gas flows in a laminar regime, creating a flow that carries sample molecules across the pressure boundary without compromising the vacuum integrity, thus resolving the contradiction between small inlet size and efficient sample intake.
Solution Approach 2:
The invention utilizes pneumatic principles by introducing a controlled flow of carrier gas through the sample introduction member. The laminar flow regime is established and maintained through careful control of gas flow parameters, enabling efficient transport of neutral molecules through the inlet while preserving the vacuum environment in the mass spectrometer.
2Reliability
If the inlet size is kept small for vacuum requirements, then the vacuum system performance is improved, but the sensitivity of mass analysis deteriorates
Solution Approach 1:
The carrier gas acts as a mediator that delivers a concentrated stream of sample molecules to the small inlet, maximizing the utilization of the limited inlet area. This intermediary approach allows the system to maintain small inlet dimensions for vacuum performance while achieving high sensitivity through enhanced molecular delivery to the inlet.
Solution Approach 2:
The invention changes the flow regime parameter to laminar flow and optimizes the carrier gas flow rate to maximize sample molecule transport efficiency. By controlling the Reynolds number and other flow parameters, the system achieves optimal sensitivity without compromising vacuum performance.
3Loss of time
If direct sampling is implemented without sample preparation, then the analysis time is reduced, but the sample transfer efficiency deteriorates
Solution Approach 1:
The sample introduction member is designed to generate and maintain laminar flow of carrier gas, which efficiently transports sample molecules directly from the ambient environment into the mass spectrometer. This pneumatic approach enables direct sampling with high transfer efficiency, eliminating the need for time-consuming sample preparation while maintaining productive sample introduction.
Solution Approach 2:
The sample introduction member features a curved or bent configuration that optimizes the flow path of the carrier gas and sample molecules. The curvature design enhances laminar flow characteristics and improves the efficiency of molecule capture and transport, enabling effective direct sampling without preparation steps.
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
These sample introduction members significantly increase the transfer efficiency of neutral molecules or ions into the mass spectrometer, improving the sensitivity of mass analysis and enabling direct sampling from ambient environments without the need for extensive sample preparation.
Implementation Method 1
The sample introduction member may include a heating element
Implementation Method 2
Sample introduction members of the invention are able to capture neutral molecules or ions of the sample that are emitted from the sample and transfer those molecules or ions to the inlet of a mass spectrometer
Data Source
AI summary
The invention generally relates to systems and methods for analyzing a sample from a surface. In certain aspects, the invention provides systems that include a sample introduction member that has an inlet, an outlet, and an opening along a wall of the sample introduction member. The sample introduction member may be configured such that the opening couples with a surface that includes a sample in a manner in which molecules of the sample enter the sample introduction member via the opening and exit the sample introduction member via the outlet. A mass spectrometer is configured to receive the molecules of the sample.