Astrophysics (Index)About

Saha equation

(Saha ionization equation, Saha-Langmuir equation)
(equation relating ionization to temperature)

The Saha equation (Saha ionization equation or Saha-Langmuir equation) yields information about the ionization of a sufficiently-thin plasma in thermodynamic equilibrium. It yields the ratio of number densities of ions at two successive states of ionization, i.e., those with i electrons missing verses those with i+1 electrons missing. It is used in stellar models. One form:

Ni+1   Zi+1  2
———— = ———— ———— (2π mekT)3/2ei/kT
 Ni     Zi  ne

(equation,physics,model,ionization)
Further reading:
https://en.wikipedia.org/wiki/Saha-Langmuir equation
http://spiff.rit.edu/classes/phys440/lectures/saha/saha.html
https://www-users.cse.umn.edu/~kd/Ast4001-2015/NOTES/n052-saha-bradt.pdf
https://phys.libretexts.org/Bookshelves/Astronomy__Cosmology/Supplemental_Modules_(Astronomy_and_Cosmology)/Cosmology/Astrophysics_(Richmond)/23%3A_The_Saha_Equation
http://www.ruf.rice.edu/~baring/astr350/astr350_2021_lec_0930.pdf
https://publish.obsidian.md/astrowiki/E.+ISM+%26+Emission/Saha+Equation
http://sun.stanford.edu/~sasha/PHYS312/2007/L2/phys312_2007_l2a.pdf
https://www.secretsofuniverse.in/sahas-equation/
https://www.tandfonline.com/doi/full/10.1080/14786441008636148
https://royalsocietypublishing.org/doi/10.1098/rspa.1921.0029

Referenced by pages:
Boltzmann equation
electron pressure
nuclear statistical equilibrium (NSE)
number density (n)
state of ionization
temperature

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