Abstract
We report an electron energy loss spectroscopy study of molecular O 2 and H 2 physisorbed on graphite at low temperatures. In both cases, electron trapping to form a temporary negative ion allows the excitation of molecular vibrational modes; in the case of H 2 rotational transitions are also observed. The angular patterns of vibrationally inelastic electrons scattered from a monolayer of O 2 at 24 K show that the molecular axis is aligned; by contrast the H 2 molecule is found to rotate freely on the surface.
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