UV Laser Cleaning for MALDI Ion Source Electrodes
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Solution Overview
Problem
The buildup of contaminant material on the electrodes of MALDI ion sources in mass spectrometers leads to reduced sensitivity and resolution, necessitating frequent cleaning, which is impractical with existing methods that require venting the evacuated housing or interrupt automated processes.
Innovation Solution
A method involving the use of UV light to desorb contaminant material from the electrodes without heating them significantly, using a laser to direct UV light onto the surfaces, either directly or via a reflecting surface, allowing for efficient cleaning without venting the ion source housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing cleaning methods are used to remove contaminant material from electrodes, then cleaning effectiveness is improved, but the evacuated housing must be vented or automated processes must be interrupted
Solution Approach 1:
A UV-transparent window is introduced as an intermediary component that allows UV light to pass through the housing wall to reach the electrodes for cleaning, while maintaining the vacuum seal of the housing. This mediator enables the cleaning function without compromising the vacuum integrity or requiring housing venting.
Solution Approach 2:
The mechanical cleaning approach (requiring physical access to electrodes through housing venting) is replaced with an optical cleaning system. UV light is used to desorb contaminant material from electrode surfaces without requiring mechanical intervention or housing opening, thus maintaining continuous operation.
2Productivity
If UV light is used to desorb contaminant material, then cleaning efficiency is improved, but heating of surfaces must be controlled below 80°C
Solution Approach 1:
The parameters of the UV light source are optimized to maximize desorption efficiency while minimizing thermal effects. By controlling the UV wavelength, pulse duration, and intensity, the cleaning process achieves high efficiency without heating surfaces above 80°C, thus preventing vacuum degradation.
Solution Approach 2:
Instead of continuous irradiation, periodic or pulsed UV light is used to clean the electrodes. This periodic action allows heat to dissipate between pulses, maintaining surface temperatures below 80°C while still achieving effective contaminant removal through repeated desorption cycles.
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 effectively removes contaminant material from electrodes, maintaining the ion source's performance without heating the surfaces above 80°C, thus preserving the vacuum and enabling continuous operation of high-throughput mass spectrometers.
Implementation Method 1
directing light on to the surface such that contaminant material is desorbed from the surface
Implementation Method 2
using a laser to direct UV light onto the surfaces
Data Source
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AI summary
The present invention is concerned with methods and apparatus for cleaning the surface of an ion source in a mass spectrometer, for example an electrode of a MALDI ion source. The method includes directing UV light onto the surface to desorb contaminant material. The UV light source can be a laser and a moving reflecting surface can be used to direct the light on to the surface.