The Complex Story of H2

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Science  03 Aug 2001:
Vol. 293, Issue 5531, pp. 815-816
DOI: 10.1126/science.1062991

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Molecular hydrogen is the most abundant species in the universe. In his Perspective, Klemperer explains how the complex electronic properties of hydrogen helps explain its behavior in space, including the formation of a rich chemistry of organic molecules in dark molecular clouds.