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International audienceWe show that the singlet-triplet separation of H2 must be lowered by 157.7 +/- 0.2 cm-1 compared to the hitherto accepted value of Dieke. We have used a new kind of "level anticrossing" method in which the anticrossing is due to the coupling of a singlet and a triplet state by spin-orbit or hyperfine Fermi contact interaction

physical review letters

Determination of the Singlet-Triplet Separation of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>by a "Level-Anticrossing" Technique

Determination of the Singlet-Triplet Separation ofH2by a "Level-Anticrossing" Technique