How are electrons accelerated in electron impact ionization?

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SUMMARY

Electrons in electron impact ionization are typically accelerated by applying a negative voltage to a filament or an electrode, creating an electric field that propels the electrons. This method is common in various experimental setups, including mass spectrometers and electron microscopes. The discussion highlights the importance of specifying the context or device when inquiring about electron acceleration methods, as multiple configurations exist. Thermionic emission is identified as a primary source for electron generation prior to acceleration.

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  • Understanding of thermionic emission principles
  • Familiarity with electric field concepts
  • Knowledge of electron impact ionization processes
  • Experience with experimental setups involving mass spectrometry or electron microscopy
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  • Explore the design and operation of mass spectrometers
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Students and professionals in physics, particularly those focusing on ionization techniques, as well as researchers working with mass spectrometry and electron microscopy technologies.

Misha Kuznetsov
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Hello, I just have a quick question about electron impact ionization.

How exactly are the electrons accelerated? Are they attracted by an anode?
 
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In what context is this happening? Is this about electron impact ionization in a specific device?
 
Misha Kuznetsov said:
Hello, I just have a quick question about electron impact ionization.

How exactly are the electrons accelerated? Are they attracted by an anode?

This is extremely vague, because there are many different ways to do this. You need to cite specific type of experiment that you had in mind. If this is from something you read, cite the exact source as you would when you cite a reference in a paper.

Zz.
 
I read it on Wikipedia : http://en.wikipedia.org/wiki/Electron_ionization

It says that electrons are produced through thermionic emissions, and then are accelerated. It didn't say how they are accelerated.

If there are multiple ways, which ones are typical and common.
 
I believe a typical way of accelerating them is to apply a negative voltage to either the filament itself or an electrode on one side of the filament so that electrons are accelerated by the electric field. I'm sure it's possible to use a positive electrode instead (or in conjunction with a negative electrode) if the configuration of the device allows it.
 

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