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|Section2= |Section3= }} The hydrogen anion is a negative ion of hydrogen, H−. The hydrogen anion is an important constituent of the atmosphere of stars, such as the Sun. In chemistry, this ion is called hydride. The ion has two electrons bound by the electromagnetic force to a nucleus containing one proton. ==Occurrence== The hydrogen anion is the dominant absorber of photons in the interstellar medium. It absorbs energies in the range 0.75–4.0 eV, which ranges from the infrared into the visible spectrum (, ). It also occurs in the Earth's ionosphere (). Its existence was first proven theoretically by Hans Bethe in 1929 (). H− is unusual because, in its free form, it has no bound excited states, as was finally proven in 1977 (). It has been studied experimentally using particle accelerators (). In chemistry, the hydride anion is hydrogen that has the oxidation state −1. Hydride compounds formally contain a hydrogen anion. Most such compounds are in fact rather covalent. An example of a hydride is borohydride (). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hydrogen anion」の詳細全文を読む スポンサード リンク
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