Hybrid Ion Source for Rapid ESI-APCI Switching
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Solution Overview
Problem
Conventional ion source devices face challenges in quickly and efficiently switching between electrospray ionization (ESI) and atmospheric pressure chemical ionization (APCI) methods, leading to decreased sensitivity and prolonged analysis times due to temperature stabilization requirements and interference between ionization modes.
Innovation Solution
A hybrid ion source with a movable ionization probe and heating chamber that allows for precise positioning relative to each other, enabling rapid switching between ESI and APCI modes without the need for temperature stabilization, maintaining optimal conditions for each method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ESI and APCI are performed concurrently in the same space, then it is possible to measure ions generated by either method, but sensitivity decreases
Solution Approach 1:
The ion source is divided into two separate ionization spaces: an ESI ionization space with a spray nozzle for electrospray ionization, and an APCI ionization space with a needle electrode for corona discharge ionization. This spatial segmentation allows each ionization method to operate independently without interference, maintaining high sensitivity for both ESI and APCI measurements
Solution Approach 2:
The ESI spray nozzle is positioned within or near the APCI ionization space, and the APCI needle electrode is positioned within or near the ESI ionization space. This nested arrangement allows both ionization systems to coexist in a compact configuration while maintaining separate ionization zones, enabling versatile measurement capability without compromising sensitivity
2Stability of the object's composition
If the heater is turned on or off when switching ionization methods, then temperature stabilization is achieved, but waiting time is generated
Solution Approach 1:
The heating chamber is designed with dynamic temperature control that can independently adjust temperature for different ionization modes. The system maintains optimal temperature for APCI (higher temperature for vaporization) when in APCI mode, and adjusts to appropriate temperature for ESI when in ESI mode, eliminating the need for temperature stabilization waiting time during mode switching
Solution Approach 2:
The system changes operational parameters including temperature, gas flow rates, and voltage settings based on the selected ionization mode. When switching from ESI to APCI, the heater temperature is increased and APCI-specific parameters are activated. When switching from APCI to ESI, the temperature is adjusted and ESI parameters are activated, allowing immediate operation in the new mode without stabilization delays
3Adaptability or versatility
If manual switching of probe from ESI to APCI is performed, then ionization method switching is achieved, but switching time is prolonged and operations become complex
Solution Approach 1:
The ion source is designed as a universal system that can perform both ESI and APCI ionization methods using a single integrated structure. The spray nozzle and needle electrode are positioned to allow either method to be activated independently through electronic control of gas flow, voltage, and heater parameters, eliminating the need for physical probe switching and reducing operational complexity
Solution Approach 2:
The manual mechanical switching of probes is replaced by an automated electronic control system that switches between ESI and APCI modes by controlling gas flow rates, voltage application, and heater temperature. This substitution of mechanical switching with electronic control dramatically reduces switching time and simplifies operations
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
Enables fast and sensitive ionization method switching, maintaining high sensitivity and throughput by optimizing the position and temperature of the ionization probe and heating chamber, preventing interference and stabilizing temperatures instantly.
Implementation Method 1
a heating chamber (11) having an internal sample flow path (17), the heating chamber being adapted to heat and vaporize a sample that flows through the sample flow path
Implementation Method 2
an ionization probe (1) for spraying a sample; wherein an ionization method is switched by moving the ionization probe (1) and/or the heating chamber (11)
Implementation Method 3
APCI is a method of ionizing sample molecules, which have been obtained by heating and vaporizing a sample solution, using corona discharge
Data Source
AI summary
In order to provide an ion source that can be easily switched with high sensitivity and in a short time, the ion source includes an ionization probe for spraying a sample, a heating chamber for heating and vaporizing a sample; and driving portions and for changing the distance between an outlet end (i.e., an end on the spray side) of the ionization probe and an inlet end (i.e., an end on the ionization probe side) of the heating chamber. The positions of the ionization probe and the heating chamber are controlled by the driving portions so that an ionization region that uses the ionization probe or an ionization region that uses the heating chamber is positioned near the ion inlet port of the mass spectrometer.