Gas Phase Ion Chemistry vs. Plasma Chemistry

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Discussion Overview

The discussion centers on the differences between "Gas Phase Ion Chemistry" and "Plasma Chemistry," particularly in the context of studying ionization and dissociation processes of hydrogen gas. Participants explore definitions, characteristics, and the relevance of each field to the topic at hand.

Discussion Character

  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants suggest that plasma implies a degree of ionization, requiring higher temperatures for sufficient ionization levels, which may make ionization and dissociation more significant in plasma than in normal gas.
  • Others question whether "Gas Phase Ion Chemistry" and "Plasma Chemistry" are simply different names for the same field, particularly in relation to studying dissociative ionization of hydrogen gas.
  • One participant emphasizes that while there are common aspects between gas and plasma, ionization is specific to the plasma state and has observable consequences that differentiate it from a gas.
  • A reference to the Saha equation is provided as a resource for understanding ionization equilibrium in plasma physics.

Areas of Agreement / Disagreement

Participants express differing views on whether the two fields are distinct or overlapping, indicating that the discussion remains unresolved regarding the definitions and implications of gas phase ion chemistry versus plasma chemistry.

Contextual Notes

There are limitations in the discussion regarding the definitions of gas and plasma, as well as the conditions under which ionization occurs, which remain unresolved.

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What is the difference between "Gas Phase Ion Chemistry" and "Plasma Chemistry"? If one wants to learn about the ionization and dissociation processes of hydrogen gas are either of theses fields appropriate to study?
 
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I think that, by its definition, the plasma phase implies some degree of ionization.
Therefore the temperature must be high enough to reach a sufficient ionization level.
Ionization and dissociation are therefore more important in a plasma than in a "normal" gas.
However, even at "ambient" temperature, there is some ionization.
In addition, ionization can be obtained by other means that high temperatures: like by exposition to radiations (UV for example).
You will find a lot of data about ionization equilibrium in plasma physics.
See for example the Saha equation:

http://en.wikipedia.org/wiki/Saha_ionization_equation
 
I've read that "Plasmas are gas phase systems". So are "Gas Phase Ion Chemistry" and "Plasma Chemistry" different names for the same field? Is this an appropriate field to study in order to learn about the dissociative ionization of hydrogen gas?
 
Please read Wikipedia about the definition of a plasma:

http://en.wikipedia.org/wiki/Plasma_(physics )

Of course we can find common aspects between a gas and a plasma.
But ionization is specific to the plasma state.
Ionization has many observable consequence that makes a plasma different from a gas.
 
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