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    Comparison of the fragmentations of phenanthrene and anthracene by low-energy electron impact

    van der Burgt, Peter J.M. and Dunne, Melissa Anne and Gradziel, Marcin (2019) Comparison of the fragmentations of phenanthrene and anthracene by low-energy electron impact. Journal of Physics: Conference Series, 1289. ISSN 1742-6588

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    We have measured sets of mass spectra for positive ions produced by low-energy electron impact on phenanthrene. Ions have been mass resolved using a reflectron time-of-flight mass spectrometer, and the electron impact energy has been varied from 0 to 100 eV in steps of 0.5 eV. Ion yield curves of most of the fragment ions have been determined by fitting groups of adjacent peaks in the mass spectra with sequences of normalized Gaussians. The aim of this paper is to provide a detailed comparison of phenanthrene with its isomer anthracene, for which we have published results in a previous paper [1]. Appearance energies for a selection of fragment ions of phenanthrene have been determined, and are compared with anthracene. The most significant differences are observed in the ion yield curves of the ions containing 12 carbon atoms. The ion yield curves of phenanthrene have higher maximum yields and lower appearance energies compared to anthracene. For the fragments containing 9 and 10 carbon atoms the phenanthrene yields are slightly lower, but the appearance energies are the same as for anthracene. Small differences in yields are also observed for the fragments with 6 and 7 carbon atoms. The double and triple ionization energies of phenanthrene have been determined and are in agreement with anthracene.

    Item Type: Article
    Additional Information: Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence ( Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. To cite this article: Peter J. M. van der Burgt et al 2019 J. Phys.: Conf. Ser. 1289 012008
    Keywords: Comparison; fragmentations; phenanthrene; anthracene; low-energy electron impact;
    Academic Unit: Faculty of Science and Engineering > Experimental Physics
    Item ID: 13565
    Identification Number:
    Depositing User: Dr Peter van der Burgt
    Date Deposited: 13 Nov 2020 16:40
    Journal or Publication Title: Journal of Physics: Conference Series
    Publisher: Institute of Physics
    Refereed: Yes
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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