Ion Trap Isolation Using Dual-Frequency Ion Ejection
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Solution Overview
Problem
Current mass-selective ion isolation techniques in quadrupole ion traps, such as SWIFT, require complex calculations and waveform generation, making them cumbersome for portable and miniature mass spectrometers.
Innovation Solution
A simplified approach using a single dipolar waveform with two frequency components is applied to the ion trap, where one frequency ejects ions lower in mass and the other ejects ions higher in mass, effectively isolating the target ion with significant frequency broadening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SWIFT techniques are used for mass-selective ion isolation, then isolation performance is excellent, but the system complexity increases due to complex calculations and waveform generation
Solution Approach 1:
The complex SWIFT waveform is segmented into multiple simple sinusoidal frequency components. Each frequency component targets a specific mass range for ejection, allowing the complex isolation task to be divided into simpler sub-tasks that can be executed sequentially or simultaneously without requiring complex waveform generation hardware or software.
Solution Approach 2:
The patent employs periodic sinusoidal waveforms at specific frequencies to achieve ion ejection. By applying simple periodic actions at carefully selected frequencies rather than complex aperiodic waveforms, the system achieves effective ion isolation with minimal computational overhead and simple hardware implementation.
2Measurement precision
If multiple frequencies are used for ion isolation, then isolation precision improves, but the number of frequencies required increases by three orders of magnitude
Solution Approach 1:
The patent changes the approach from using many frequencies at low amplitude to using few frequencies at high amplitude. By adjusting the amplitude parameter of a small number of carefully selected frequency components, the system achieves the same isolation precision that would otherwise require hundreds or thousands of frequency components, dramatically reducing the complexity of the isolation process.
3Reliability
If complex waveform generation is implemented, then ion isolation performance improves, but ease of operation decreases
Solution Approach 1:
The patent replaces expensive, complex waveform generation systems with simple, inexpensive sinusoidal oscillators. The complex SWIFT waveform is replaced by a sequence of simple sinusoidal pulses that can be generated by basic electronic components, making the system easier to operate and more suitable for portable applications while maintaining adequate isolation performance.
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 method reduces the number of frequencies required for ion isolation by three orders of magnitude while maintaining performance comparable to SWIFT, making it particularly beneficial for portable instruments.
Implementation Method 1
A first frequency of the dual frequency waveform is higher than the secular frequency of the target ion. A second frequency of the dual frequency waveform is lower than the secular frequency of the target ion. In that manner, non-target ions are ejected from the ion trap while the target ion remains in the ion trap.
Data Source
AI summary
The invention generally relates to systems and methods for isolating a target ion in an ion trap. In certain aspects, the invention provides a system that includes a mass spectrometer having an ion trap, and a central processing unit (CPU). The CPU includes storage coupled to the CPU for storing instructions that when executed by the CPU cause the system to apply a dual frequency waveform to the ion trap that ejects non-target ions from the ion trap while retaining a target ion in the ion trap.