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An error about unit in the user guide of plasma module
Posted Oct 5, 2016, 4:14 a.m. EDT Plasma Physics 4 Replies
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The error is about the rates of the electron impact reactions.
If we press "F1" when the mouse focused on a "electron impact reaction", we can see the following sentences,
"For Rate coefficients either enter in the lookup table or load in from file a table of mean electron energy (eV) versus rate coefficient (SI unit: m3/s). "
I think the unit of rate coefficient used in COMSOL actually is [m3/mol/s], but I'm not sure about it.
Is there anyone who can tell me which one([m3/s] or [m3/mol/s]) is right?
If we press "F1" when the mouse focused on a "electron impact reaction", we can see the following sentences,
"For Rate coefficients either enter in the lookup table or load in from file a table of mean electron energy (eV) versus rate coefficient (SI unit: m3/s). "
I think the unit of rate coefficient used in COMSOL actually is [m3/mol/s], but I'm not sure about it.
Is there anyone who can tell me which one([m3/s] or [m3/mol/s]) is right?
4 Replies Last Post Oct 7, 2016, 3:50 a.m. EDT
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Posted:
8 years ago
Hi,
If you import cross ==> the unit is eV and cm^2
If you enter Forward rate constant ==> the unit is [m3/mol/s].
In publication you find rate constant in [m3/s]. You must multiply the value by Avogadro number to find [m3/mol/s].
If you import cross ==> the unit is eV and cm^2
If you enter Forward rate constant ==> the unit is [m3/mol/s].
In publication you find rate constant in [m3/s]. You must multiply the value by Avogadro number to find [m3/mol/s].
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Posted:
8 years ago
Hi,
If you import cross ==> the unit is eV and cm^2
If you enter Forward rate constant ==> the unit is [m3/mol/s].
In publication you find rate constant in [m3/s]. You must multiply the value by Avogadro number to find [m3/mol/s].
Thank you. But I want to know what is the Default unit when I enter a Rate Coefficient. For example, when I enter a list of electron energy VS rate coefficient,
1 1e-15
2 2e-15
3 3e-15
...
what is the unit of the second column values in COMSOL, [m3/s] or [m3/mol/s]?
Based on the COMSOL user's guide, the unit is [m3/s], and the above form of the values is OK.
BUT,
If the unit was [m3/mol/s], the second column should be mulitiplied by N_A_const and changed as
1 1e-15*N_A_const
2 2e-15*N_A_const
3 3e-15*N_A_const
....
SO, I want to know what is the default unit of the second column data in COMSOL.
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Posted:
8 years ago
Hi,
You can't put
electron energy VS rate coefficient,
1 1e-15
2 2e-15
3 3e-15
For electron dissociation (or attachement or....) you have electron energy VS cross section ==> eV VS cm^2
For other reaction the default unit is [m3/mol/s] and you should mulitiplied by N_A_const
You can't put
electron energy VS rate coefficient,
1 1e-15
2 2e-15
3 3e-15
For electron dissociation (or attachement or....) you have electron energy VS cross section ==> eV VS cm^2
For other reaction the default unit is [m3/mol/s] and you should mulitiplied by N_A_const
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Posted:
8 years ago
Are you a user or worker for COMSOL?
Actually for the electron impact reaction, a list of electron energy vs. rate coefficient can be loaded in COMSOL. Please see the attached picture about a snapshot of the "Settings" window.
Actually for the electron impact reaction, a list of electron energy vs. rate coefficient can be loaded in COMSOL. Please see the attached picture about a snapshot of the "Settings" window.
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