SHIM 2015 Swift Heavy Ions in Matter

Since the prediction of the Interatomic Coulombic Decay (ICD) by Cederbaum et al. in 1997 [1], the rare gas atomic dimers have been widely investigated by photon impact. However, the investigation of dimers with the ions and electrons as the projectile is still scare [2-6]. For neon dimer, only a few works involved with heavy ions were reported [4]. Utilizing the reaction microscope [7], we investigated the fragmentation of neon dimer induced by highly charged O6+ ion at the projectile energy of 240 keV. In the present work, we clearly observed four peaks in the spectrum of kinetic energy release (KER) for Ne+-Ne+ pair, which locate at 4.5, 7.3, 8.5, and 9.7 eV, and are marked by A, B, C, and D successively. By comparing with the potential curve of Ne2 [8], we clarified the fragmentation mechanisms of them. The peak A results from the coulombic explosion (CE) and ICD, while the peak B results from radiation charge transfer (RCT) of one-site states Ne2+(2p4)-Ne. The peaks C and D can be ascribed to the contribution of the radiationless charge transfer [9]. These two peaks were the first time observed in transfer ionization and pure double electron capture processes induced by heavy ions. This work was partially supported by the 973 Program of China under Grants No. 2010CB832902 and by the NSFC of China under Grants Nos. 10979007, 10974207 and 11274317. References [1] L. S. Cederbaum et al 1997 Phys. Rev. Lett.79, 4778. [2] J. Matsumoto et al 2010 Phys. Rev. Lett. 105, 263202. [3] J. Titze et al 2011 Phys. Rev. Lett. 106, 033201. [4] H.-K. Kim et al 2013 Phys. Rev. A 88, 042707; 2014 Phys. Rev. A 89, 022704. [5] S. Yan et al 2013 Phys. Rev. A 88, 042712; 2014 Phys. Rev. A 89, 062707 [6] W. Iskandar et al 2014 Phys. Rev. Lett. 113, 143201. [7] X Ma et al 2011 Phys. Rev. A 83, 052707. [8] S D Stoychev et al 2008 J. Chem. Phys. 129, 074307. [9] K. Kreidi et al 2008 Phys. Rev. A 78, 043422.