Etude la multiplicité de l'émission éléctronique secondaire de cibles minces de carbone sous l'impact d'ions H0, H2+, H3+ et d'ions moléculaires d'énergie de l'ordre du MeV.

Abstract : This work focuses on the study of the emission of secondary electrons from thin carbon foils bombarded with H0, H2+ and H3+ projectiles in the 0.25-2.2 MeV energy range.

The phenomenum of secondary electron emission fomr solids under the impact of swift ions is mainly due to inelastic interactions with target electrons. The phenomenological and theoritical descriptions, as well as a summary of the main theoritical models are the subject of the first chapter.

The experimental set-up used to measure event by event the electron emission of the two faces of a thin carbon foil traversed by an energetic projectile is described in the chapter two. In this chapter are also presented the methods and algorithms used to process experimental spectras in order to obtain the statistical disctribution of emitted electrons.

Chapter three presents the measurements of secondary electron emission induced by H0 atoms passing through thin carbon foils. The secondary electron yieldsare studied in correlation with the emergent projectile charge state. We show the peculiar role of the projectile electron, whether it remains or not bound to the incident proton.

The fourth chapter is dedicated to the secondary emission induced by H2+ and H3+ polyatomic ions. The results are intepreted in terms of collective effects in the interactions of these ions with solids. The role of the proximity of the protons, molecular ion fragments, upon the amplitude of these collective effect is evidenced from the study of the statistics of forward emission.

These experience allowed us to shed light on various aspects of atom and polyatomic ion interactions with solid surfaces.
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Theses
Atomic Physics. Université Claude Bernard - Lyon I, 1997. French


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Submitted on : Monday, October 23, 2006 - 9:39:45 PM
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Zvonimir Vidovic. Etude la multiplicité de l'émission éléctronique secondaire de cibles minces de carbone sous l'impact d'ions H0, H2+, H3+ et d'ions moléculaires d'énergie de l'ordre du MeV.. Atomic Physics. Université Claude Bernard - Lyon I, 1997. French. <tel-00108534>

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