Silicon-Coated Ion Source for Hydrogen-Stable Mass Spectra
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Solution Overview
Problem
Chromatographic peaks and mass spectra distortion occurs when hydrogen is used as a carrier gas or cleaning agent in gas chromatograph/mass spectrometers, leading to incorrect compound identification due to unwanted interactions with analyte molecules and ions, particularly for compounds with functional groups susceptible to hydrogenation.
Innovation Solution
An ion source with components partially coated with silicon or silicon hydride to reduce reactivity, minimizing distortion and tailing in chromatographic peaks and improving mass spectral fidelity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydrogen is used as carrier gas or cleaning agent, then productivity and cleaning efficiency are improved, but mass spectral fidelity and chromatographic peak shape deteriorate due to unwanted interactions with analyte molecules
Solution Approach 1:
A silicon-based coating material is introduced as an intermediary layer between the hydrogen gas and the analyte molecules/ions. This coating acts as a mediator that allows hydrogen to perform its cleaning function while preventing direct harmful interactions with the analyte, thus maintaining both productivity and measurement precision.
Solution Approach 2:
The silicon-based coating creates an inert environment on the ion source surfaces, preventing hydrogen from directly interacting with analyte molecules. This inert barrier allows the use of hydrogen as carrier gas while avoiding the formation of degradation products that would compromise spectral fidelity.
2Productivity
If hydrogen is used as carrier gas, then productivity is improved, but chromatographic peak shape and identification accuracy deteriorate due to hydrogenation of functional groups
Solution Approach 1:
The silicon-based coating serves as a protective intermediary that prevents hydrogen from directly contacting and hydrogenating the analyte molecules. This intermediary layer enables the use of hydrogen carrier gas while maintaining proper chromatographic peak shapes and identification accuracy.
Solution Approach 2:
The coating creates an inert atmosphere on all ion source surfaces, preventing hydrogenation reactions that would otherwise distort chromatographic peaks and compromise identification accuracy, thereby allowing high-productivity hydrogen carrier gas operation.
3Ease of operation
If conventional ion source surfaces are used with hydrogen, then ease of operation is maintained, but spectral fidelity and compound identification accuracy deteriorate
Solution Approach 1:
The physical-chemical parameters of the ion source surfaces are changed by applying silicon-based coatings. This modification alters the surface properties to be less reactive with hydrogen, thereby improving spectral match values and compound identification accuracy while maintaining ease of operation.
Solution Approach 2:
The ion source is transformed into a composite structure with silicon-based coating layers applied to key surfaces. This composite material approach combines the operational simplicity of conventional sources with the chemical inertness needed to maintain high spectral fidelity when using hydrogen.
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 silicon-coated ion source enhances spectral match values and accurate identification of compounds like nitrobenzene and 3-nitroaniline, reducing or eliminating tailing in total ion chromatograms and extracted ion chromatograms, thereby improving integration and identification accuracy.
Implementation Method 1
distortion of chromatographic peaks and mass spectra generated with a gas chromatograph/mass spectrometer can occur when hydrogen is present as either the carrier gas or as a cleaning agent added to the source when helium is the carrier gas. Unwanted interactions of analyte molecules and ions with hydrogen and materials in the ionization source of the mass spectrometer result in problems such as changes in the mass spectrum and the distortion (tailing) of chromatographic peaks.
Implementation Method 2
ionizing the sample by at least one of the plurality of components making the ion flow path to provide ions
Data Source
AI summary
Provided herein is an ion source containing a plurality of components, at least one of which is partially coated with a layer of silicon. The ion source reduces reactivity between the sample and the carrier gas, reduces or eliminates tailing in ion chromatograms, and/or improves mass spectral fidelity. Also provided are methods of using the ion source in a mass spectrometer or gas chromatograph-mass spectrometer.