Low-energy ions interacting with anthracene molecules and clusters

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• 作者：P. Rousseau^a ; ^b ; ^c ; ^d ; ^{prousseau@ganil.fr} ; A. Ł ; awicki^a ; ^b ; ^c ; ^d ; A.I.S. Holm^e ; M. Capron^a ; ^b ; ^c ; ^d ; R. Maisonny^a ; ^b ; ^c ; ^d ; S. Maclot^a ; ^b ; ^c ; ^d ; E. Lattouf^a ; ^b ; ^c ; ^d ; H.A.B. Johansson^e ; F. Seitz^e ; A. Mé ; ry^a ; ^b ; ^c ; ^d ; J. Rangama^a ; ^b ; ^c ; ^d ; H. Zettergren^e ; S. Rosé ; n^e ; H.T. Schmidt^e ; J.-Y. Chesnel^a ; ^b ; ^c ; ^d ; A. Domaracka^a ; ^b ; ^c ; ^d ; B. Manil^f ; L. Adoui^a ; ^b ; ^c ; ^d ; H. Cederquist^e ; B.A. Huber^a ; ^b ; ^c ; ^d
• 关键词：PAH ; Clusters ; Ion collisions ; Ionization ; Fragmentation
• 刊名：Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
• 出版年：2012
• 出版时间：15 May, 2012
• 年：2012
• 卷：279
• 期：Complete
• 页码：140-143
• 全文大小：547 K

文摘

The interaction of slow ions with a small polycyclic aromatic hydrocarbon, namely anthracene (C₁₄H₁₀), is studied in the gas-phase either with the isolated molecule or with a pure cluster target. We discuss the ionization and fragmentation of the molecule with respect to the projectile charge state, i.e. for singly charged He⁺ ions and for multiply charged Xe²⁰⁺ ions. For the isolated C₁₄H₁₀, single or multiple ionization of the molecule occurs under ion impact. The (multi) cation relative yields are compared with those obtained by other ionization methods (electron and fs-laser). The molecular dissociation occurs by loss of hydrogen and small hydrocarbon molecules, leading to the formation of C_nH_x cations. The interaction of Xe²⁰⁺ with C₁₄H₁₀ clusters gives surprising results, i.e. the emission of hotter monomer compared to the interaction with He⁺.