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Science 6 February 1976:
Vol. 191. no. 4226, pp. 463 - 464
DOI: 10.1126/science.191.4226.463
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Articles

Doubly Charged Negative Atomic Ions of Hydrogen

MICHAEL ANBAR 1 and RAFAEL SCHNITZER 1

1 Mass Spectrometry Research Center, Stanford Research Institute, Menlo Park, California 94025

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.

Submitted on November 17, 1975

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Science. ISSN 0036-8075 (print), 1095-9203 (online)