Photoionisation of the tropyl radical
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- We present a study on the photoionisation of the cycloheptatrienyl (tropyl) radical, \(C_7H_7\), using tunable vacuum ultraviolet synchrotron radiation. Tropyl is generated by flash pyrolysis from bitropyl. Ions and electrons are detected in coincidence, permitting us to record mass-selected photoelectron spectra. The threshold photoelectron spectrum of tropyl, corresponding to the \(X^{+1}A1’ ← X^2E_2”\) transition, reveals an ionisation energy of 6.23 ± 0.02 eV, in good agreement with Rydberg extrapolations, but slightly lower than theWe present a study on the photoionisation of the cycloheptatrienyl (tropyl) radical, \(C_7H_7\), using tunable vacuum ultraviolet synchrotron radiation. Tropyl is generated by flash pyrolysis from bitropyl. Ions and electrons are detected in coincidence, permitting us to record mass-selected photoelectron spectra. The threshold photoelectron spectrum of tropyl, corresponding to the \(X^{+1}A1’ ← X^2E_2”\) transition, reveals an ionisation energy of 6.23 ± 0.02 eV, in good agreement with Rydberg extrapolations, but slightly lower than the value derived from earlier photoelectron spectra. Several vibrations can be resolved and are reassigned to the C–C stretch mode \(ν_{16}^+\) and to a combination of \(ν_{16}^+\) with the ring breathing mode \(ν_2^+\). Above 10.55 eV dissociative photoionisation of tropyl is observed, leading to the formation of \(C_5H_5^+\) and \(C_2H_2\).…
Autor(en): | Kathrin H. Fischer, Patrick Hemberger, Andras Bodi, Ingo Fischer |
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URN: | urn:nbn:de:bvb:20-opus-128652 |
Dokumentart: | Artikel / Aufsatz in einer Zeitschrift |
Institute der Universität: | Fakultät für Chemie und Pharmazie / Institut für Physikalische und Theoretische Chemie |
Sprache der Veröffentlichung: | Englisch |
Titel des übergeordneten Werkes / der Zeitschrift (Englisch): | Beilstein Journal of Organic Chemistry |
Erscheinungsjahr: | 2013 |
Band / Jahrgang: | 9 |
Seitenangabe: | 681-688 |
Originalveröffentlichung / Quelle: | Beilstein Journal of Organic Chemistry 2013, 9, 681–688. doi:10.3762/bjoc.9.77 |
DOI: | https://doi.org/10.3762/bjoc.9.77 |
Allgemeine fachliche Zuordnung (DDC-Klassifikation): | 5 Naturwissenschaften und Mathematik / 54 Chemie / 547 Organische Chemie |
Freie Schlagwort(e): | dissociative photoionisation; gas phase; reactive intermediates; synchrotron radiation; threshold photoelectron spectroscopy |
Datum der Freischaltung: | 31.03.2016 |
Lizenz (Deutsch): | CC BY: Creative-Commons-Lizenz: Namensnennung |