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Photofragmentation Patterns of Cobalt Oxide Cations ConOm+ (n = 5–9, m = 4–13): From Oxygen-Deficient to Oxygen-Rich Species
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    A: Kinetics, Dynamics, Photochemistry, and Excited States

    Photofragmentation Patterns of Cobalt Oxide Cations ConOm+ (n = 5–9, m = 4–13): From Oxygen-Deficient to Oxygen-Rich Species
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    The Journal of Physical Chemistry A

    Cite this: J. Phys. Chem. A 2020, 124, 37, 7333–7339
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    https://doi.org/10.1021/acs.jpca.0c01545
    Published July 2, 2020
    Copyright © 2020 American Chemical Society

    Abstract

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    Cobalt oxide clusters, ConOm+ (5 ≤ n ≤ 9 and 4 ≤ m ≤ 13), are produced by laser vaporization and studied by time-of-flight mass spectrometry. Specific stoichiometries are mass separated and photofragmented using 355 nm laser light. The preferred fragmentation channels of m = n–1, m = n–2, and mn species are investigated. Loss of oxygen molecules is the favorable dissociation channel of mn clusters. While ConOn–2+ clusters decay via the loss of a Co atom, the photofragmentation behavior of ConOn–1+ species interestingly can be divided into two regimes: the n ≤ 6 clusters tend to lose an oxygen atom, but for n > 6 they favorably dissociate via the loss of a cobalt atom. The geometric structures of selected m = n – 2 species are studied using density functional theory calculations. Dissociation energies for different evaporation channels are calculated and thermodynamically favorable channels are found to correspond to the experimental observations.

    Copyright © 2020 American Chemical Society

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    Supporting Information

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.jpca.0c01545.

    • Selected photofragmentation spectra of ConOm+ (n = 6–9, m > n) clusters recorded at 355 nm laser light with a fluence of 80 mJ/cm2, the list of all parent clusters and their corresponding fragments detected in our experiments and experimental and calculated results in literature for comparison, the contribution of conformational entropy to remove an atom or a molecule from a cobalt oxide cluster. (PDF)

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    Cited By

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    This article is cited by 2 publications.

    1. Nguyen Thi Mai, Tran Dang Thanh, Do Hung Manh, Nguyen Thi Ngoc Anh, Ngo Thi Lan, Phung Thi Thu, Nguyen Thanh Tung. Stability and magnetic properties of transition metal (V, Cr, Mn, and Fe) doped cobalt oxide clusters: a density functional theory investigation. RSC Advances 2024, 14 (48) , 36031-36039. https://doi.org/10.1039/D4RA05482B
    2. Kobe De Knijf, Johan van der Tol, Piero Ferrari, Sandrien Scholiers, Gao-Lei Hou, Peter Lievens, Ewald Janssens. Influence of oxidation on the magnetism of small Co oxide clusters probed by Stern–Gerlach deflection. Physical Chemistry Chemical Physics 2022, 25 (1) , 171-182. https://doi.org/10.1039/D2CP05202D

    The Journal of Physical Chemistry A

    Cite this: J. Phys. Chem. A 2020, 124, 37, 7333–7339
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.jpca.0c01545
    Published July 2, 2020
    Copyright © 2020 American Chemical Society

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