Off-Axis Ion Extraction Assembly for Dual-Laser Sample Analysis
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Solution Overview
Problem
Conventional mass spectrometry systems are complex, costly, and limited in their ability to effectively analyze both organic and inorganic components of a sample, often requiring significant capital investment, space, and training, and face challenges with ionization efficiency and matrix effects.
Innovation Solution
A system and method that utilize a dual-beam laser setup with a neodymium-doped yttrium aluminum garnet (Nd:YAG) laser for desorption and ablation, combined with a two-step multiphoton ionization process, to efficiently extract and analyze both organic and inorganic materials within a sample, using a mass spectrometer under vacuum conditions to minimize interference and enhance quantification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional mass spectrometry systems are used, then analysis capability is provided, but system complexity and cost increase significantly
Solution Approach 1:
The system separates the ionization and extraction functions into distinct modular components: a laser ionization source that creates ions from the sample, and a quadrupole mass filter that selectively transmits ions based on mass-to-charge ratio. This segmentation allows each component to be optimized independently and simplifies the overall system architecture compared to conventional integrated mass spectrometers.
Solution Approach 2:
The quadrupole assembly serves multiple functions: it acts as an ion guide to transport ions from the source, as a mass filter to select specific ions based on their mass-to-charge ratio, and as a beam shaper to control the ion beam profile. This multi-functionality reduces the number of separate components needed in the system.
2Adaptability or versatility
If conventional mass spectrometry systems are used, then analysis can be performed, but capital investment and space requirements increase
Solution Approach 1:
The ion extractor tip is positioned inside the quadrupole assembly, with the extractor inlet located within the space defined by the quadrupole rods. This nested arrangement allows the extraction region to be contained within the mass filter structure, maximizing space utilization and minimizing the overall instrument footprint.
3Productivity
If conventional ion extraction methods are used, then ion detection is achieved, but ionization efficiency is limited
Solution Approach 1:
The system uses dynamic control of the quadrupole rod voltages to switch between different operational modes: in extraction mode, the rods are configured to guide ions from the source to the detector with high transmission efficiency, while in rejection mode, the voltage configuration changes to exclude ions of specific mass ranges. This dynamic control optimizes ionization efficiency for different analytical requirements.
Solution Approach 2:
The quadrupole assembly operates by changing the radiofrequency and direct current voltage parameters applied to the rods. By dynamically adjusting these electrical parameters, the system can optimize ion transmission for different mass-to-charge ratios, improving ionization efficiency and reducing matrix effects through selective ion filtering.
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 system enables efficient analysis of both organic and inorganic components with high ionization efficiency, reduced matrix effects, and improved quantification capabilities, suitable for benchtop and field applications, while reducing the size and cost of the analysis system.
Implementation Method 1
a beam is applied to the sample along the aperture axis, a cloud of material removed from the sample by the beam passes through the aperture
Implementation Method 2
the ion extractor assembly generates a rejection field to direct ions of the cloud of material away from the ion extractor inlet, and an acceptance state in which the ion extractor assembly generates an acceptance field to direct ionized material toward the ion extractor inlet
Implementation Method 3
The resulting ions are then accelerated and subjected to an electromagnetic field resulting in varying deflection of the ions based on their respective mass-to-charge ratios
Data Source
AI summary
A system includes a sample chamber, an aperture plate defining an aperture having an aperture axis aligned with a sample location within the sample chamber. The system further includes a first laser source to produce a cloud of material from a sample and a second laser source configured to produce ionized material from the cloud of material. The system also includes an ion extractor assembly defining an ion extraction path and a mass spectrometer in communication with the ion extractor assembly. The ion extractor assembly is switchable between a rejection state in which the ion extractor assembly generates a rejection field to direct ions of the cloud of material away from the ion extractor inlet, and an acceptance state in which the ion extractor assembly generates an acceptance field to direct ionized material produced by the second beam along the ion extraction path.