Ion
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| Ion | |
|---|---|
| Name | Ion |
| Caption | Charged particle representation |
| Charge | positive or negative |
| Formed | electron transfer, photoionization, collision |
| Common examples | proton, electron-deficient cation, electron-rich anion |
Ion
An ion is an electrically charged particle formed when an atom or molecule gains or loses one or more electrons, producing species with net positive or negative charge. Ions play central roles across fields including Chemistry, Physics, Astronomy, Biology, and Environmental science and are fundamental to phenomena studied in institutions such as the CERN and observatories like the Hubble Space Telescope. Ions underpin technologies developed by companies and laboratories including IBM, Bell Labs, and national facilities like the Lawrence Berkeley National Laboratory.
Definition and Nomenclature
The term for a charged particle was formalized in early modern studies by researchers connected to Royal Society discussions and later codified in nomenclature employed by the International Union of Pure and Applied Chemistry. Positive ions, historically called cations in literature associated with figures like Michael Faraday and Svante Arrhenius, lose electrons and migrate toward the cathode in electrolysis experiments exemplified by work at the Faraday Lectures. Negative ions, historically termed anions, gain electrons, a behavior described in contexts such as Davy lamp studies and the development of the Alkali metals chemistry. Systematic naming conventions for complex ions reflect rules promulgated by the IUPAC and are used in conjunction with mineralogical classification from institutions like the Smithsonian Institution.
Formation and Ionization Processes
Ions are produced through processes extensively investigated in experiments at facilities like the Lawrence Livermore National Laboratory and the Max Planck Institute for Chemistry. Common mechanisms include electron transfer during redox reactions studied by Antoine Lavoisier's successors, photoionization induced by ultraviolet radiation observed with instruments on the Voyager probes, and collision-induced ionization prevalent in plasmas created in tokamaks such as ITER and in particle accelerators like those at SLAC National Accelerator Laboratory. Gas-phase ionization techniques such as electron impact were refined in mass spectrometry pioneered at Caltech and ion sources developed for the Manhattan Project era. Surface ionization, field ionization, and biological ion channel gating investigated at laboratories like Salk Institute also produce charged species.
Types of Ions
Ionic species span simple atomic ions encountered in the study of Periodic Table elements—such as protons studied in Cavendish Laboratory experiments and halide anions characterized in work by Robert Boyle—to complex polyatomic ions described in the organic chemistry literature emerging from Harvard University and University of Cambridge research groups. Coordination complexes forming complex cations and anions are central to research at the Max Planck Institute for Chemical Energy Conversion and in catalysis studies at MIT. Radical ions investigated in Bell Labs and ionic clusters probed at Argonne National Laboratory illustrate intermediate regimes. Molecular ions important in astrochemistry are detected by teams using facilities like the Atacama Large Millimeter Array and interpreted with theories from Paul Dirac and Erwin Schrödinger.
Physical and Chemical Properties
Ionic charge, ionic radius, polarizability, and hydration energy determine behavior described in textbooks by authors affiliated with Oxford University Press and Cambridge University Press. Properties such as lattice energy are central to salt formation discussed in studies from universities including University of California, Berkeley and influence phase behavior observed in high-pressure experiments at Geological Survey laboratories. Ion mobility and conductivity underpin research at industrial labs like Siemens and influence device performance in battery research at Toyota Research Institute and Tesla-funded projects. Interionic interactions manifest in crystal structures cataloged by the International Crystallographic Database and influence reactivity patterns used in synthetic methodologies in publications from American Chemical Society journals.
Detection and Measurement
Analytical methods for ions include mass spectrometry techniques developed at Brookhaven National Laboratory and spectroscopy approaches refined at facilities like Lawrence Livermore National Laboratory. Electrochemical detection using electrodes and potentiostats from manufacturers such as Metrohm and techniques like cyclic voltammetry taught in courses at Stanford University quantify ionic species. Ion-selective electrodes calibrated against standards from organizations like National Institute of Standards and Technology are widely used. Remote sensing of ionic species in planetary atmospheres is conducted using instruments on missions like Mars Reconnaissance Orbiter and interpreted by researchers at Jet Propulsion Laboratory.
Biological and Environmental Roles
Ions such as sodium, potassium, calcium, and chloride are central to physiology studied by researchers at the National Institutes of Health and in classic work by Alan Hodgkin and Andrew Huxley on membrane electrophysiology. Ion channels and pumps characterized in laboratories including the Howard Hughes Medical Institute regulate nerve impulses and muscle contraction. Environmental cycling of ions like nitrate and sulfate involves processes monitored by agencies such as the Environmental Protection Agency and by field campaigns affiliated with Woods Hole Oceanographic Institution and Lamont–Doherty Earth Observatory. Atmospheric ions contribute to aerosol formation explored in studies by the European Space Agency and affect conductivity profiles measured in ionospheric research at the International Space Station.
Applications and Technological Uses
Ions are exploited in technologies ranging from mass spectrometers used by Pfizer and GlaxoSmithKline in pharmaceutical analysis to ion propulsion systems developed by teams at NASA and ESA for spacecraft. Electrochemical energy storage in lithium-ion batteries is a central industry focus at companies like Panasonic and research consortia at Argonne National Laboratory. Ion implantation processes are critical in semiconductor fabrication at fabs run by TSMC and Intel Corporation. Medical techniques such as ion-beam therapy are applied in cancer treatment centers like Cleveland Clinic and facilities associated with GSI Helmholtz Centre for Heavy Ion Research.