The Ã 2Π u →[Xtilde] 2Π g electronic emission spectrum of the fluorine molecular ion F2 + studied in a supersonic beam

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Colleges, School and Institutes


The Ã 2Π u →[Xtilde] 2Π g spectrum of F2 + has been recorded at a low rotational temperature in a crossed molecular beam/electron beam apparatus. Approximately 100 vibrational bands have been fitted into two Deslandres tables (one for the Ω=3/2, one for the Ω=1/2 components), and vibrational constants determined for both states. Rotational analyses have been performed on the strong bands, and rotational constants obtained for both electronic states. The absolute numbering of the Deslandres tables has been established by comparing experimentally observed intensities with those predicted from Franck-Condon calculations; the numbering used by Porter in some earlier work (1968, J. chem. Phys.48, 2071) is shown to be incorrect. Finally, data from this optical emission spectrum are reconciled with the most accurate photoelectron data of neutral F2.


Original languageEnglish
Pages (from-to)475-486
JournalMolecular Physics
Issue number2
Publication statusPublished - 10 Jun 1983