Abstract
We report the detection of the (H2)2dimer in the atmospheres of Saturn and Neptune based on spectra of the fundamentalS1(1) collision-induced band of H2. The lines of this dimer are potentially useful for probing the (H2)2ortho–para ratio and its implications for atmospheric dynamical processes. We also report the detection of the (1–0)S1(1) quadrupole absorption line of monomeric H2in these spectra.
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