Mass Spectrometer Inlet Geometry for Faster Ionization
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Solution Overview
Problem
Mass spectrometers face challenges in adjusting sample gas flow speed, accelerating ionization reactions, and preventing neutralization of ionized samples, which affect measurement accuracy.
Innovation Solution
A mass spectrometer design featuring an ion generation unit, ion selection unit, reaction unit, and ion detection unit, with a sample inflow pipe providing an inclined path that forms an acute angle with the reaction path, allowing for gradual diffusion and mixing with carrier gases, and including quadrupole filters for ion selection and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the sample gas flows directly into the reaction path, then the flow speed is high, but the ionization reaction is insufficient and neutralization occurs
Solution Approach 1:
The sample inflow pipe is inclined at an angle of 10 to 50 degrees relative to the reaction path, introducing a spatial dimension change. This angular configuration allows the sample gas to enter the reaction path at an optimized angle, reducing direct high-speed impact while ensuring sufficient residence time for ionization reactions to occur, thereby preventing neutralization.
Solution Approach 2:
The patent changes the flow parameters by controlling the flow rate of sample gas to be 0.01 to 10 mL/min and carrier gas to be 0.1 to 100 mL/min. By adjusting these flow rate parameters and the inclined angle parameter, the system optimizes the balance between flow speed and ionization efficiency, ensuring adequate reaction time without excessive neutralization.
2Productivity
If the sample gas flow speed is increased, then productivity improves, but measurement accuracy decreases due to insufficient ionization
Solution Approach 1:
By inclining the sample inflow pipe at 10 to 50 degrees, the system creates an optimized flow trajectory that maintains higher throughput while ensuring adequate ionization. This angular configuration allows faster overall processing without sacrificing measurement accuracy.
Solution Approach 2:
The patent establishes specific parameter ranges: sample gas flow rate of 0.01 to 10 mL/min, carrier gas flow rate of 0.1 to 100 mL/min, and inflow angle of 10 to 50 degrees. These parameter optimizations enable high productivity while maintaining measurement accuracy through sufficient ionization reactions.
3Loss of time
If the sample gas enters the reaction path at a high speed, then the analysis time is reduced, but ion neutralization increases
Solution Approach 1:
The inclined inflow configuration changes the temporal characteristics of gas entry by distributing the sample introduction over an angular path rather than direct impact. This reduces the effective residence time at high velocity while maintaining adequate overall analysis time, preventing ion neutralization and preserving signal reliability.
Solution Approach 2:
By controlling the sample gas flow rate to 0.01 to 10 mL/min and the inflow angle to 10 to 50 degrees, the system optimizes the balance between analysis speed and ion signal quality. These parameter settings ensure rapid analysis without excessive neutralization, maintaining reliable ion detection.
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 design allows for adjustable sample gas flow speed, accelerated ionization reactions, and reduced neutralization of ions, thereby enhancing the accuracy of mass spectrometry measurements.
Implementation Method 1
the sample inflow path includes an inclined path, wherein the inclined path extends to form an acute angle (α) with respect to the first direction... the inclined path may include a diffusion path of which a diameter increases gradually in an extension direction of the inclined path
Implementation Method 2
The specimen may be ionized using various methods inside the mass spectrometer. The ionized specimen may be accelerated while passing through an electric and/or magnetic field
Implementation Method 3
The ionized specimen may be accelerated while passing through an electric and/or magnetic field. A detector may detect the ionized specimen
Data Source
AI summary
Provided is a mass spectrometer including: an ion generation unit configured to provide an ion generation path; an ion selection unit configured to provide an ion selection path connected to the ion generation path; a reaction unit configured to provide a reaction path connected to the ion selection path; a second ion selection unit configured to provide a second ion selection path connected to the reaction path; and an ion detection unit coupled to the second ion selection unit. The ion selection path and the reaction path extend in a first direction, and the reaction unit includes: a reaction pipe extending in the first direction to define the reaction path; and a sample inflow pipe coupled to the reaction pipe. The sample inflow pipe provides a sample inflow path connected to the reaction path, and the sample inflow path includes an inclined path. The inclined path extends to form an acute angle (α) with respect to the first direction.