E-field lowering of ionization potential

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SUMMARY

The discussion centers on the phenomenon of field ionization in mass spectrometry, specifically exploring the Schottky effect, which describes the lowering of ionization potential in the presence of a strong electric field. It highlights that while a high electric field can facilitate ionization, even a moderately high field can reduce the energy required to ionize atoms or molecules. This effect is analogous to the reduction of the work function in metals under high electric fields, indicating a broader application in atomic and molecular ionization processes.

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  • Understanding of field ionization in mass spectrometry
  • Familiarity with the Schottky effect and its implications
  • Knowledge of atomic and molecular ionization energies
  • Basic principles of electric fields and their effects on matter
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  • Research the Schottky effect in detail and its applications in various fields
  • Explore the principles of mass spectrometry and field ionization techniques
  • Investigate the relationship between electric fields and work function in metals
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Researchers in physical chemistry, physicists studying atomic interactions, and professionals in mass spectrometry looking to enhance their understanding of ionization processes under electric fields.

free_electron
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When an electric field is high enough, electrons are not so easily confined to molecules or atoms. This has been the basis of field ionization for mass spectrometry. But what if the field is not enough to ionize, but close. Would it be easier to ionize the atom or molecule with less energy? Any reference on this?

Thanks in advance.
 
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This is loosely known as the Schottky effect (just be careful because this term is used elsewhere for other similar phenomena). We see this all the time as the lowering of the work function of metals when it is in very high electric field. So this is certainly similar to the case for atoms and molecules where the ionization energy has been lowered due to the external field.

Zz.
 

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