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Updated: 2023-07-18 10:36:38 + 4

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shwetha729 2023-07-18 10:36:40 -04:00
parent 8f658ba014
commit 30cfccc933
4 changed files with 13 additions and 9 deletions
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14
enter/.obsidian/workspace.json
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@ -42,8 +42,12 @@ gas that is present in the gap.
The discharge concept becomes simpler if instead of thinking about the electric field between the electrodes which is the driver for the discharge process. Of course the shape and distance between electrodes determine the electric field, but the the electrons are only driven by the electric field. Putting in the geometry at this point only confuses the issues.
Consider this, a free electron will travel along the electric field from the negative electrode to the positive electrode and gather energy in the process.
If there is neutral gas along the path, the electron can bounce off of a gas molecule while transferring some of its energy to the molecule. If the electron has an energy less than the ionization energy of the gas molecule, that is all that happens (e + i --> e+ i). If the electron has more than the ionization energy of the gas molecule, then the electron will give up some of its energy to the molecule causing an electron from the molecule to be ejected. The result of this is  e + i --> 2e + i. We then have can have an avalanche process producing huge number of electrons which will result in a high current between the electrodes.
If there is neutral gas along the path, the electron can bounce off of a gas molecule while transferring some of its energy to the molecule.
If the electron has an energy less than the ionization energy of the gas molecule, that is all that happens (e + i --> e+ i). If the electron has more than the ionization energy of the gas molecule, then the electron will give up some of its energy to the molecule causing an electron from the molecule to be ejected. The result of this is  e + i --> 2e + i. We then have can have an avalanche process producing huge number of electrons which will result in a high current between the electrodes.
---
What determines the probability of an electron colliding with a neutral molecule and ionizing it? 
1) the electron has to have energy greater than the ionization potential of the particular type of gas molecule 
2) The probability of a electron-molecule collision. This probability is very roughly the area of the molecule (cross-section) and the number density of the molecule in the gas times the path length between the electrodes. Pc ~ A x Nd x L. More commonly this is expressed as a distance = mean free path (MFP) for the electron molecule problem.  If the MFP is shorter than the distance between electrode there should be a ionizing collision. If the MFP is much smaller than the inter-electrode spacing there will be many collisions.