Title Reanalysis and identification of an $Rh^{2+}$ dimer center in NaCl by combined application of 9.5 and 95 GHz EPRReanalysis and identification of an $Rh^{2+}$ dimer center in NaCl by combined application of 9.5 and 95 GHz EPR Author Vercammen, H. Goovaerts, E. Käß, H. Bouwen, A. Schoemaker, D. Faculty/Department Faculty of Sciences. Physics Research group Experimental condensed matter physics (ECM) Department of Physics Publication type article Publication 1998London, 1998 Subject Physics Chemistry Source (journal) Journal of the Chemical Society: Faraday transactions: physical chemistry and chemical physics / Chemical Society [London] - London Source (book) 31st International Meeting of the ESR Group of the Royal-Society-of-Chemistry, 1998, UNIV MANCHESTER, MANCHESTER, ENGLAND Volume/pages 94(1998):19, p. 3003-3007 ISSN 0956-5000 ISI 000076287900023 Carrier E Target language English (eng) Full text (Publishers DOI) Affiliation University of Antwerp Abstract A combined 9.5 (X-band) and 95 GHz (W-band) EPR study of an Rh2+ dimer center in Bridgman-grown rhodium-doped NaCl is presented. A close-to-tetragonal symmetry, similar to that of the monomer centers, with dominant symmetry axis along [001], the z-axis, is observed for this defect. The dimer and monomer spectra, which strongly overlap in the X-band spectra, could be well separated in the W-band measurements due to the higher g-resolution at higher magnetic fields. The anisotropy in the perpendicular plane, with [110] symmetry directions, is shown, from the combined X-and W-band spectra, to derive predominantly from a held-independent contribution, i.e. an orthorhombic spin-spin interaction, S-1.D.S-2 (S-1 = S-2 = 1/2), while the g matrices are near to axial, as in the case of the RhCl64-.2Vac monomer center (Vac = cation vacancy). This dimer center is shown to consist of a square arrangement of two substitutional Rh2+ ions and two next-nearest neighbor cation vacancies in an {001}-plane, with the Rh2+ ions on opposite corners at a distance of ca. 7.6 Angstrom, as estimated from the magnitude of the dipolar interaction. This work illustrates the ability of combined EPR experiments at widely different frequencies to discriminate field-independent from field-dependent terms in the spin-Hamiltonian. Full text (open access) https://repository.uantwerpen.be/docman/irua/10824c/4858.pdf E-info http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000076287900023&DestLinkType=RelatedRecords&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000076287900023&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000076287900023&DestLinkType=CitingArticles&DestApp=ALL_WOS&UsrCustomerID=ef845e08c439e550330acc77c7d2d848 Handle