Ion Analyzer Radical Generation Unit for Sensitivity Maintenance
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Solution Overview
Problem
The detection sensitivity and mass accuracy of product ions in ion analyzers deteriorate over repeated analyses due to radical loss and electrode surface oxidation during the use of existing dissociation methods.
Innovation Solution
An ion analyzer configuration that includes a radical generation unit, a gas supply system for selective introduction of oxidizing and reducing gases, and a control unit to manage operations, which performs specific operations to regenerate radicals and reduce metal oxide formation on electrodes, maintaining sensitivity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If precursor ions are irradiated with radicals generated by vacuum discharge in an insulating tube, then selective dissociation at specific sites (e.g., amino acid binding positions) is achieved, but detection sensitivity and mass accuracy deteriorate over repeated analyses
Solution Approach 1:
The patent introduces a rare gas (such as helium or argon) into the insulating tube to create an inert atmosphere that prevents metal deposition on the inner wall. The rare gas atoms collide with and remove deposited metal atoms through physical sputtering, maintaining the insulating tube's radical generation efficiency over repeated analyses without requiring frequent cleaning or replacement.
Solution Approach 2:
The patent implements a gas exchange mechanism where the rare gas is introduced to remove deposited metal from the insulating tube inner wall. This recovery process restores the tube's ability to generate radicals efficiently, allowing the system to maintain performance over time by periodically removing accumulated contaminants.
2Productivity
If radicals are continuously generated by vacuum discharge, then product ions are efficiently produced, but metal deposits on the insulating tube inner wall causing radical loss
Solution Approach 1:
The rare gas creates an inert environment that prevents metal atoms from adhering to the insulating tube inner wall during vacuum discharge. By introducing this protective atmosphere, the system maintains radical generation efficiency without the progressive degradation caused by metal deposition, thereby preventing radical loss while sustaining high productivity.
Solution Approach 2:
The patent converts the potentially harmful effect of metal deposition into a beneficial cleaning mechanism. The rare gas atoms, when introduced, physically collide with and remove deposited metal through sputtering, transforming the accumulation problem into a self-cleaning process that restores and maintains system performance.
3Productivity
If oxidation reactions occur during radical irradiation, then product ions are generated, but electrode surfaces become oxidized reducing detection sensitivity
Solution Approach 1:
The rare gas establishes an inert atmosphere around the electrodes, preventing oxygen from reaching and oxidizing the electrode surfaces during radical irradiation. This protective environment allows oxidation reactions to proceed in the gas phase for product ion generation while keeping electrode surfaces clean and conductive, maintaining detection sensitivity.
Solution Approach 2:
The patent separates the oxidation function from the electrode surfaces by conducting oxidation reactions in the gas phase using rare gas atoms or radicals. This segmentation allows the electrodes to perform only their electrical function without suffering from surface oxidation, while the oxidation chemistry occurs independently in the surrounding inert atmosphere.
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 configuration effectively suppresses the deterioration of detection sensitivity and mass accuracy by regenerating radicals and reducing electrode surface oxidation, ensuring consistent performance in ion analysis.
Implementation Method 1
Radio-frequency power is supplied to the coil to generate vacuum discharge inside the insulating tube to generate hydrogen radicals
Implementation Method 2
When any of an oxygen gas, an ozone gas, a nitrogen gas, and a gas of a compound containing an oxygen atom or a nitrogen atom is used as the second gas, the metal deposited on the inner wall surface of the insulating tube reacts with the oxygen atom or the nitrogen atom contained in the second gas, and the metal, which eliminates the radicals, changes to a metal oxide or a metal nitride
Implementation Method 3
a heating unit configured to heat the electrode to the thermal decomposition temperature
Data Source
AI summary
An ion analyzer includes: a reaction chamber 2 into which precursor ions derived from a sample component are introduced; a radical generation unit including an insulating tube 551, and a discharge unit 54, 552 configured to generate a discharge inside the insulating tube; a gas supply unit 52, 53 capable of supplying a first gas which is a radical raw material gas, and a second gas which is any of an oxygen gas, an ozone gas, a nitrogen gas, a gas of a compound containing an oxygen atom or a nitrogen atom, and a rare gas to an inside of the insulating tube; an evacuation unit 57 configured to evacuate the inside of the insulating tube; a radical introduction unit 55 configured to introduce radicals into an inside of the reaction chamber; and a control unit 93 configured to perform a first operation of introducing the first gas into the inside of the insulating tube, generating radicals by generating a discharge, and introducing the radicals into the inside of the reaction chamber, and a second operation of introducing the second gas into the inside of the insulating tube.