Multi-mode Ionization Device for Trace Substance Detection
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Solution Overview
Problem
Current ionization devices face challenges in reliably detecting trace-level concentrations of substances, particularly in atmospheric research and security applications, due to limitations in detection time and the formation of unwanted adducts, which can interfere with mass/charge ratio measurements.
Innovation Solution
A Multimethod Ionization Device (MID) that utilizes multiple reagent ion species and ionization mechanisms, including chemical ionization, to selectively enhance analyte visibility and shorten detection time by forming adducts effectively, allowing for rapid switching between ionization schemes without changing devices, and incorporating features like laminar flow and electric fields to guide adducts for analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single reagent ion source is used for chemical ionization, then the device structure is simple, but the ability to perform multiple ionization modes simultaneously is limited
Solution Approach 1:
The single reagent ion source is segmented into two separate reagent ion sources (first reagent ion source and second reagent ion source), each capable of generating different reagent ions independently. This segmentation enables simultaneous multi-mode ionization while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
The reaction chamber is designed to serve multiple functions: it receives analytes, mixes them with reagent ions from both sources, and performs chemical ionization reactions. This multi-functional design allows the system to achieve versatile ionization modes without proportionally increasing overall device complexity.
2Measurement precision
If reagent ions from two sources are mixed before entering the reaction chamber, then the mixing is simple, but ion signal interference and reduced sensitivity occur
Solution Approach 1:
The ion introduction system is segmented into separate pathways: each reagent ion source introduces its ions independently into the reaction chamber through separate interfaces. This prevents premature mixing and signal interference while maintaining system manageability through modular connection design.
Solution Approach 2:
The reaction chamber acts as an intermediary space where reagent ions from both sources and analytes meet and mix under controlled conditions. This intermediary approach allows for controlled interactions that preserve ion signal integrity while achieving the desired chemical ionization reactions.
3Adaptability or versatility
If conventional chemical ionization is used, then the device operation is simple, but the ability to perform post-source decay and other advanced techniques is limited
Solution Approach 1:
The system is designed with dynamic capabilities allowing switching between different ionization modes (chemical ionization, post-source decay, etc.) by controlling the operation of different reagent ion sources and adjusting reaction chamber parameters. This dynamic design enables versatile ionization techniques while maintaining operational simplicity through standardized control interfaces.
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 MID device significantly improves the detection of trace-level substances by increasing analyte adduct formation, reducing detection time, and enhancing the visibility of analyte species in mass spectrometry, enabling the identification of illicit substances and atmospheric species with higher sensitivity and specificity.
Implementation Method 1
two types of reagent ions that are generated by ionizing two reagents (R1, R2) in two separate reagent ion sources
Implementation Method 2
The analyte (S) is ionized by chemical ionization by reactions with the reagent ions
Data Source
Figure 1
Figure 1A
Figure 1B~6
AI summary
The invention relates to a multi-mode ionization device (MID, 300B) in which two types of reagent ions that are generated by ionizing two reagents (R1, R2) in two separate reagent ion sources (302) are introduced into a reaction chamber (CH1) in which they are mixed with analytes (S) that are introduced into the reaction chamber as an analyte flow (301). The analyte (S) is ionized by chemical ionization by reactions with the reagent ions.