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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/115552


    Title: The key energy scales of Gd-based metallofullerene determined by resonant inelastic X-ray scattering spectroscopy
    Authors: Shao, Y.-C.;Wray, L.A.;Huang, S.-W.;Liu, Y.-S.;Song, W.;Yang, S.;Chuang, Y.-D.;Guo, J.d;Pong, W.-F.
    Date: 2017-08-25
    Issue Date: 2018-11-08 12:11:44 (UTC+8)
    Publisher: Nature Publishing Group
    Abstract: Endohedral metallofullerenes, formed by encaging Gd inside fullerenes like C80, can exhibit enhanced proton relaxitivities compared with other Gd-chelates, making them the promising contrast agents for magnetic resonance imaging (MRI). However, the underlying key energy scales of Gd x Sc3−x N@C80 (x  =  1–3) remain unclear. Here, we carry out resonant inelastic x-ray scattering (RIXS) experiments on Gd x Sc3−x N@C80 at Gd N 4,5-edges to directly study the electronic structure and spin flip excitations of Gd 4f electrons. Compared with reference Gd2O3 and contrast agent Gadodiamide, the features in the RIXS spectra of all metallofullerenes exhibit broader spectral lineshape and noticeable energy shift. Using atomic multiplet calculations, we have estimated the key energy scales such as the inter-site spin exchange field, intra-atomic 4f–4f Coulomb interactions, and spin-orbit coupling. The implications of these parameters to the 4f states of encapsulated Gd atoms are discussed.
    Relation: Scientific Reports 7(1), 8125
    DOI: 10.1038/s41598-017-08685-5
    Appears in Collections:[Graduate Institute & Department of Physics] Journal Article

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