Properties of resonant interatomic Coulombic decay in Ne dimers |
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Authors: | Aoto T Ito K Hikosaka Y Shigemasa E Penent F Lablanquie P |
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Institution: | Photon Factory, Institute of Materials Structure Science, Oho, Tsukuba 305-0801, Japan. |
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Abstract: | Properties of the interatomic Coulombic decay (ICD) process in Ne dimers have been obtained by tracking the formation of energetic Ne+ ions. The double photoionization cross section, deduced from the Ne+/Ne+ coincidence signal, is dominated by the ICD process and presents a threshold 280 meV below the atomic Ne+2s(-1) threshold. Rydberg excitation of a 2s electron in the dimer creates molecular Rydberg states whose Sigma and Pi symmetries have been resolved. These excited states decay by a resonant ICD process releasing an energetic Ne+ ion and a neutral excited Ne* fragment. Subsequent autoionization of the Ne* fragment explains a double photoionization threshold below the dimer 2s ionization threshold. |
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