title: Effect of collective response on electron capture and excitation in collisions of highly charged ions with fullerenes.
abstract: Projectile deexcitation Lyman x-ray emission following electron capture and K excitation has been studied in collisions of bare and Li-like sulphur ions (of energy 110 MeV) with fullerenes (C(60)/C(70)) and different gaseous targets. The intensity ratios of different Lyman x-ray lines in collisions with fullerenes are found to be substantially lower than those for the gas targets, both for capture and excitation. This has been explained in terms of a model based on "solidlike" effect, namely, wakefield induced stark mixing of the excited states populated via electron capture or K excitation: a collective phenomenon of plasmon excitation in the fullerenes under the influence of heavy, highly charged ions.
authors.affiliation: Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai-400005, India.
authors.forename: U
authors.initials: U
authors.lastname: Kadhane
authors.forename: D
authors.initials: D
authors.lastname: Misra
authors.forename: Y P
authors.initials: YP
authors.lastname: Singh
authors.forename: Lokesh C
authors.initials: LC
authors.lastname: Tribedi