Recombination of plasma ions and electrons

In summary, the high temperature and pressure of plasma prevents the recombination of positive ions and electrons, and recombination is also a source of energy loss in some plasmas.
  • #1
asdf1
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If plasma is a collection of positive ions and electrons, why don't they recombine together and become neutral?
 
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  • #3
asdf1 said:
If plasma is a collection of positive ions and electrons, why don't they recombine together and become neutral?
they will until the atom gets hit by a high energy particle and ionizes it again.

Recombination is a source of loss of energy from some plasmas.

Also, as malawi_glenn indicated, if the electron and ion temperatures are high, the electron will not recombine with the atom.

Consider that fusion plasmas have energies on the order of keV, and compare this with the ionization temperature of 13.6 eV for H, or 24.6 eV for 1st ionization energy of He.

http://facultyfp.salisbury.edu/dfrieck/htdocs/212/rev/table/ie.htm

The ions and electrons remain somewhat 'spatially' neutral, in that net postive or negative areas do not readily form.

Electrons also interaction the ions through brehmsstrahlung interaction, which is also a source of energy loss from plasmas, as well as cyclotron radiation.
 

1. What is recombination of plasma ions and electrons?

Recombination of plasma ions and electrons is a process in which free electrons and ions combine to form neutral atoms. This process is responsible for reducing the number of charged particles in a plasma, as well as releasing energy in the form of photons.

2. How does recombination affect plasma properties?

Recombination can significantly impact the properties of a plasma. It can decrease the plasma density, increase the temperature, and change the chemical composition. Additionally, recombination can also affect the plasma's conductivity and the production of electromagnetic radiation.

3. What factors influence the rate of recombination?

The rate of recombination can be influenced by several factors, including the density and temperature of the plasma, the types of ions and electrons present, and the presence of impurities. The type and strength of the electric and magnetic fields in the plasma can also affect the rate of recombination.

4. How is recombination studied and measured?

Recombination can be studied and measured through various experimental techniques, including spectroscopy, Langmuir probes, and particle-in-cell simulations. These methods allow scientists to observe the behavior of ions and electrons in a plasma and track the rate of recombination.

5. What are the practical applications of recombination in plasma physics?

Recombination plays a crucial role in many practical applications of plasma physics, including fusion energy research, plasma processing, and plasma-based technologies such as plasma TVs and fluorescent lights. Understanding recombination is essential for developing and improving these technologies.

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