Lesson plan
Delayed extraction
, Middle: the red ion takes the lead since it has a greater velocity (and kinetic energy) but since it is farther from the acceleration plate at voltage +V, it gains less energy than the blue ion. Bottom: The blue ion has gained sufficient energy such that it arrives at the detector at the same time as the red ion. Delayed extraction is a method used with a time-of-flight mass spectrometer in which the accelerating voltage is applied after some short time delay following pulsed laser desorption/ionization from a flat surface of target plate or, in other implementation, pulsed electron ionization or Resonance enhanced multiphoton ionization in some narrow space between two plates of the ion extraction system. The extraction delay can produce time-of-flight compensation for ion energy spread and improve mass resolution.
Article summary
, Middle: the red ion takes the lead since it has a greater velocity (and kinetic energy) but since it is farther from the acceleration plate at voltage +V, it gains less energy than the blue ion. Bottom: The blue ion has gained sufficient energy such that it arrives at the detector at the same time as the red ion. Delayed extraction is a method used with a time-of-flight mass spectrometer in which the accelerating voltage is applied after some short time delay following pulsed laser desorption/ionization from a flat surface of target plate or, in other implementation, pulsed electron ionization or Resonance enhanced multiphoton ionization in some narrow space between two plates of the ion extraction system. The extraction delay can produce time-of-flight compensation for ion energy spread and improve mass resolution.
Key claims
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
Bibliography
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Key claims and bibliography are generated from the same tracked claims and sources as the article page.