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Doubly Charged Negative Atomic Ions of Hydrogen

The existence of a relatively long-lived doubly charged negative atomic ion H2– (and D2–), isoelectronic with the lithium atom, has been demonstrated by mass spectrometry through a combined analysis of ion energy, velocity, and momentum. This species, formed in a hydrogen plasma, has a half-life of 2.3 x 10–8 seconds before it spontaneously dissociates to produce H– ions.