Laboratory measurements of the recombination of PAH ions with electrons: implications for the PAH charge state in interstellar clouds

被引:20
作者
Biennier, Ludovic [1 ]
Alsayed-Ali, Mohamed
Foutel-Richard, Anne
Novotny, Oldrich
Carles, Sophie
Rebrion-Rowe, Christiane
Rowe, Bertrand
机构
[1] CNRS, UMR 6627, Lab Phys Atom Lasers Mol & Surfaces, Rennes, France
[2] Univ Rennes 1, Rennes, France
关键词
D O I
10.1039/b516858a
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Laboratory measurements of the recombination of polycyclic aromatic hydrocarbon (PAH) ions with electrons are presented. Experimental data have been obtained at room temperature for azulene (C10H8) and acenaphthene (C12H10) cations by the Flowing Afterglow with PhotoIons method. The results confirm that the recombination of PAH ions is fast although well below the geometrical limit. The set of our recent and present measurements reveal a definite trend of increasing rate with the number of carbon atoms of the PAH. This behaviour that needs further characterization is potentially of great interest for charge state models as recombination is a dominant mechanism of PAH ion destruction in the interstellar medium. The design of experiments to measure the recombination of larger PAHs and their temperature dependence is discussed.
引用
收藏
页码:289 / 301
页数:13
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