Mass Spectrometer Ion Source Electron Flow Control
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Solution Overview
Problem
Existing mass spectrometers suffer from faster contamination and decay rates due to excessive ion production, leading to varying sensitivity, tuning, and accuracy issues over time, requiring frequent calibration and maintenance, especially when operating at higher sensitivity levels than necessary for analysis.
Innovation Solution
A method and apparatus that adjust the operating parameters, such as the electron flow rate, to maintain a consistent ion production target by monitoring operational characteristics during multiple analytical runs, thereby compensating for changes over time and reducing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the mass spectrometer operates at higher sensitivity levels to produce more ions, then the detection capability is improved, but the contamination rate and decay rate of the ion source increase
Solution Approach 1:
The patent implements dynamic adjustment of electron flow rate based on real-time monitoring of ion production. The system transitions from static high sensitivity operation to dynamic operation where the electron flow rate is continuously optimized to maintain minimum required ion production while reducing excess ion generation that causes contamination
Solution Approach 2:
The system changes the operating parameter (electron flow rate) from a fixed high value to a dynamically adjusted value. By monitoring ion production and adjusting the electron flow rate parameter in real-time, the system maintains adequate detection capability while operating at lower average electron flow rates that reduce ion source contamination and extend operational lifetime
2Quantity of substance
If the mass spectrometer operates at higher sensitivity to produce more ions, then the ion production is improved, but the operational lifetime of the ion source decreases
Solution Approach 1:
The system implements self-monitoring and self-adjustment where the mass spectrometer automatically monitors its own ion production levels and adjusts the electron flow rate accordingly. This eliminates the need for external intervention or frequent manual calibration, allowing the system to maintain optimal operation throughout the ion source lifetime
Solution Approach 2:
The patent implements a feedback loop where ion production is monitored and this information is used to adjust the electron flow rate. The feedback mechanism ensures that ion production remains at the minimum required level rather than operating at excessive levels, thereby reducing contamination accumulation and extending ion source operational lifetime
3Quantity of substance
If the mass spectrometer operates at higher sensitivity levels, then the ion production is improved, but the tuning and accuracy of mass identification change over time
Solution Approach 1:
The system dynamically adjusts the electron flow rate to maintain consistent ion production characteristics over time. By operating at optimized, lower electron flow rates rather than continuously high rates, the system reduces the rate of contamination accumulation that causes tuning drift, thereby maintaining mass identification accuracy throughout the analytical batch
4Duration of action of stationary object
If split mode injection or sample extract dilution is used to reduce ion production, then the ion source lifetime is extended, but the chromatographic integrity and analyte response are compromised
Solution Approach 1:
The patent extracts the ion production control function from the sample introduction system. Instead of modifying the sample injection or dilution process, the system directly controls electron flow rate to the ion source, separating the ion production control from the chromatographic sample delivery system and preserving chromatographic integrity while extending ion source lifetime
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 approach extends the operational lifetime of the ion source, maintains consistent data quality across samples, and reduces the need for frequent calibration and maintenance by optimizing ion production to the minimum required sensitivity level.
Implementation Method 1
Some existing ion sources produce ions using a technique known as electron ionization (EI)
Data Source
AI summary
A mass spectrometer and a technique for operating it involve setting an operating parameter that influences a rate of flow of electrons from an electron source into an ion volume so that ions produced from a material in the ion volume in response to electrons satisfy an ion production target, performing a plurality of analytical runs using the mass spectrometer with the electron source while monitoring an operational characteristic, and adjusting the operating parameter in response to the monitoring to compensate for a change over time in the operational characteristic in a manner so that the ion production target remains satisfied.