The Influence of Energy Density Inside the Nuclear Track on the Secondary-Ion Emission

R Neugebauer,T Jalowy,JAM Pereira,EF da Silveira,H Rothard, M Toulemonde,KO Groeneveld

Nuclear instruments and methods in physics research Section B, Beam interactions with materials and atoms/Nuclear instruments & methods in physics research Section B, Beam interactions with materials and atoms（2003）

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摘要

Secondary ion emission yields from polycrystalline LiF and deuterated amorphous carbon a-C:D, bombarded by isotachic projectiles at 1.4 MeV/u, were studied as a function of the projectile atomic number (C, N, Ar, Kr, Sn) and consequently, as a function of the electronic stopping power. The emitted, positively charged secondary ions were analysed by a time of flight mass spectrometer. The H+ ions originate on the top surface near the track core, while heavier secondary ions (e.g. hydrocarbons) originate from the region of the track halo. Emission of Li+ from LiF was observed for all projectiles. On the other hand, only Sn projectiles were able to produce D+ emission from a-C:D. The results are discussed considering the deposited energy density.

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关键词

ion-solid interaction,secondary ion mass spectrometry,time of flight technique,secondary ion desorption

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