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Penning ionization : ウィキペディア英語版
Penning ionization
Penning ionization is a form of chemi-ionization, an ionization process involving reactions between neutral atoms or molecules.
The Penning effect is put to practical use in applications such as gas-discharge neon lamps and fluorescent lamps, where the lamp is filled with a Penning mixture to improve the electrical characteristics of the lamps.
==History==
The process is named after the Dutch physicist Frans Michel Penning who first reported it in 1927. Penning started to worked at the Philips Natuurkundig Laboratorium at Eindhoven to continue the investigation of electric discharge on rare gases. Later, he started measurements on the liberation of electrons from metal surfaces by positive ions and metastable atoms, and especially on the effects related to ionization by metastable atoms.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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