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Ionization ○｜Definition｜1st｜20260107121223-00-⌔

Ionization - Wikipedia

Ionization

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Ionization or ionisation is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons, often in conjunction with other chemical changes. The resulting electrically charged atom or molecule is called an ion. Ionization can result from the loss of an electron after collisions with subatomic particles, collisions with other atoms, molecules, electrons, positrons,1 protons, antiprotons,2 and ions,345678910 or through the interaction with electromagnetic radiation.11 Heterolytic bond cleavage and heterolytic substitution reactions can result in the formation of ion pairs. Ionization can occur through radioactive decay by the internal conversion process, in which an excited nucleus transfers its energy to one of the inner-shell electrons causing it to be ejected.

Printed 2026-06-28.

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Footnotes

  1. Machacek, J.R.; McEachran, R.P.; Stauffer, A.D. (2023). “Positron Collisions”. Springer Handbook of Atomic, Molecular, and Optical Physics. Springer Handbooks. Springer. doi:10.1007/978-3-030-73893-8_51. ISBN 978-3-030-73892-1. ↩

  2. Kirchner, Tom; Knudsen, Helge (2011). “Current status of antiproton impact ionization of atoms and molecules: theoretical and experimental perspectives”. Journal of Physics B: Atomic, Molecular and Optical Physics. 44 (12) 122001. Bibcode:2011JPhB…44l2001K. doi:10.1088/0953-4075/44/12/122001. ↩

  3. Brandsen, B.H. (1970). Atomic Collision Theory. Benjamin. ISBN 978-0-8053-1180-8. ↩

  4. Stolterfoht, N; DuBois, R.D.; Rivarola, R.D. (1997). Electron Emission in Heavy Ion-Atom Collisions. Springer-Verlag. ISBN 978-3-642-08322-8. ↩

  5. McGuire, J.H. (1997). Electron correlation dynamics in atomic collisions. Cambridge University Press. ISBN 978-0-521-48020-8. ↩

  6. Eichler, J. (2005). Lectures on Ion-Atom Collisions: From Nonrelativistic to Relativistic Velocities. Elsevier. ISBN 978-0-444-52047-0. ↩

  7. Bransden, B.H.; McDowell, M.R.C. (1992). Charge Exchange and the Theory of Ion-Atom Collisions. Clarendon Press; Oxford University Press. ISBN 978-0-19-852020-7. ↩

  8. Janev, R.K.; Presnyakov, L.P.; Shevelko, V.P. (1985). Physics of Highly Charged Ions. Springer. ISBN 978-3-642-69197-3. ↩

  9. Schulz, Michael (2019). Schulz, Michael (ed.). Ion-Atom Collisions The Few-Body Problem in Dynamic Systems. De Gruyter. doi:10.1515/9783110580297. ISBN 978-3-11-057942-0. ↩

  10. D., Belkic (2009). Quantum Theory of High-Energy Ion-Atom Collisions. CRC Press. ISBN 978-1-58488-728-7. ↩

  11. Schmelcher, P.; Schweitzer, W. (2002). Atoms and Molecules in Strong External Fields. Kulver Academic Publishers. ISBN 0-306-45811-X. ↩

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