Properties of resonant interatomic Coulombic decay in Ne dimers.
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.
Aoto
T
T
Photon Factory, Institute of Materials Structure Science, Oho, Tsukuba 305-0801, Japan.
Ito
K
K
Hikosaka
Y
Y
Shigemasa
E
E
Penent
F
F
Lablanquie
P
P