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Photophysics, Electronic Spectroscopy and Relaxation of Molecular Ions and Radicals with Special Reference to Polycyclic Aromatic Hydrocarbons

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Polycyclic Aromatic Hydrocarbons and Astrophysics

Part of the book series: NATO ASI Series ((ASIC,volume 191))

Abstract

Structural and dynamic aspects of molecular ions and radicals relevant to the possible role of polycyclic aromatic hydrocarbons (PAH) In the interstellar medium are discussed. Processes of formation of radicals and ions are reviewed, with emphasis, for ions, on the role of superexclted states. Differences between open and closed shell hydrocarbon species, of relevance to their optical spectroscopy and relaxation properties, are discussed. Trends In the first ionization potentials of PAH’s are considered in relation to graphite as a limiting case. Techniques for studying the electronic spectra of molecular ions and radicals are reviewed and general problems in the analysis of their vibronic structure are discussed. Matrix effects on electronic spectra and the effects of a number of parameters on rotational band contours of gas phase species are considered. Intramolecular nonradiative transition studies are evoked for both radicals and Ions and this Is followed by discussions on experimental and theoretical aspects of the Intra- and Inter- molecular chemistry of these species. Finally, some properties of doubly-charged molecular ions are presented in connection with their possible formation and destruction In the case of polycyclic aromatic hydrocarbons in the interstellar medium.

Laboratoire assoclé à l’Unlversité de paris-Sud.

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Authors and Affiliations

  1. Département d’Astrophysique Fondamentale, Observatoire de Parls-Meudon, 92190, Meudon, France

    Sydney Leach

  2. Laboratoire de Photophysique Moléculaire du C.N.R.S., Université de Paris-Sud, 91405, Orsay, France

    Sydney Leach

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  1. Groupe de Physique des Solides de l’Ecole Normale Supérieure, Université Paris VII, France

    A. Léger  & L. d’Hendecourt  & 

  2. C.E.N., Saclay, France

    N. Boccara

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Leach, S. (1987). Photophysics, Electronic Spectroscopy and Relaxation of Molecular Ions and Radicals with Special Reference to Polycyclic Aromatic Hydrocarbons. In: Léger, A., d’Hendecourt, L., Boccara, N. (eds) Polycyclic Aromatic Hydrocarbons and Astrophysics. NATO ASI Series, vol 191. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4776-4_10

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