How are electrons accelerated in electron impact ionization?

[Misha Kuznetsov]

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

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

 

[Drakkith]

In what context is this happening? Is this about electron impact ionization in a specific device?

 

[ZapperZ]

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.

 

[Misha Kuznetsov]

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.

 

[Drakkith]

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.