Multi-channel Mass Spectrometer Flight Path Control
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Solution Overview
Problem
Existing time-of-flight mass spectrometers face limitations in achieving high mass resolution and dynamic range due to the short flight path, which restricts their ability to differentiate between particles with similar m/z ratios, especially when dealing with intense ion beams.
Innovation Solution
A mass spectrometer design that incorporates an electrode arrangement for multiple reflections of charged particles, combined with a detection arrangement that includes multiple detectors and modulators, allowing for temporal focusing and adjustment of the detection parameters to optimize the flight path length and prevent detector saturation, thereby enhancing mass resolution and dynamic range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the flight path length is increased to improve mass resolution, then the time-of-flight difference between particles of different m/z ratios is increased, but the repetition rate is reduced and the duty cycle is reduced
Solution Approach 1:
The flight path is divided into multiple segments with electrostatic ion mirrors creating multiple reflections. This segmentation allows the ion beam to traverse a long effective flight path (increasing mass resolution) while the physical instrument remains compact, enabling higher repetition rates by reducing the time ions spend in the instrument between injections.
Solution Approach 2:
The patent employs nested electrostatic mirrors where ions are reflected multiple times through the same physical space. This nesting of reflection paths within a compact volume achieves long flight path length (improving mass resolution) without proportionally increasing instrument size, thereby maintaining higher repetition rates.
2Productivity
If ion storage devices are used to restore duty cycle, then the number of ions in each mass peak is increased, but this increases the range of intensities beyond detector capabilities
Solution Approach 1:
The detection arrangement dynamically adjusts its parameters based on the intensity of the ion beam. Multiple detectors with different dynamic ranges are used, and the system can switch between or combine signals from different detectors depending on the ion intensity, allowing accurate detection across a wide range of ion numbers without saturation.
Solution Approach 2:
Different detectors are positioned at different locations along the flight path, each optimized for specific intensity ranges. The first detector handles high-intensity regions while the second detector handles low-intensity regions, allowing the system to process the full dynamic range of ion intensities simultaneously.
3Device complexity
If a single detector is used, then the device complexity is reduced, but the dynamic range and ability to detect multiple charged particles arriving at the same time is limited
Solution Approach 1:
The detection arrangement is segmented into multiple detectors, each with different characteristics and dynamic ranges. This segmentation allows the system to detect a wider range of ion intensities simultaneously, with each detector optimized for specific intensity ranges, thereby increasing overall dynamic range while maintaining manageable complexity.
Solution Approach 2:
The multiple detectors serve different functions: the first detector handles high-intensity signals while the second detector handles low-intensity signals. This multi-functionality allows a single detection arrangement to process the full dynamic range of ion intensities, effectively making the system universal for detecting both abundant and trace ions.
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 significantly increases the flight path length, improving mass resolution and dynamic range, allowing for better differentiation between particles with similar m/z ratios and reducing the duty cycle, while preventing detector saturation and improving throughput.
Implementation Method 1
This is achieved by using multiple electrostatic ion mirrors, or multiple electrostatic sectors
Implementation Method 2
mass-to-charge ratios (m/z) are determined by measuring time of flight over a predetermined distance
Implementation Method 3
charged particles are accelerated along a flight path by the application of an electric potential
Data Source
AI summary
A mass spectrometer and method of mass spectrometry wherein charged particles in a beam undergo multiple changes of direction. A detection arrangement detects a first portion of the charged particle beam, and provides a first output based upon the intensity of the detected first portion of the charged particle beam. The detection arrangement detects a second portion of the charged particle beam that has traveled a greater path length through the mass spectrometer than the first portion of the charged particle beam, and provides a second output based upon the detected second portion of the charged particle beam. A controller adjusts the parameters of the charged particle beam and/or the detection arrangement, based upon the first output of the detection arrangement, so as to adjust the second output of the detection arrangement.