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Instruments / Technical Area	Publication Details	Published	Actions
B18-Core EXAFS	The local environment of Dy Emma Barney , Zhuoqi Tang , Angela Seddon , David Furniss , Slawomir Sujecki , Trevor Benson , Nigel Neate , Diego Gianolio Rsc Advances 4 (80), 42364 - 42371 DOI: 10.1039/C4RA07192A Show Abstract ▼ Abstract: The environment of Dy3+ is investigated when it is added as DyCl3 or Dy foil into two base glasses, Ge16.5As19−xGaxSe64.5, where x = 3 or 10 at%, at doping levels between 0 and 3000 parts per million by weight (ppmw) Dy3+. Extended X-ray Absorption Fine Structure demonstrates the glasses doped with Dy foil, or less than 1000 ppmw Dy3+ as DyCl3, contain Dy ions that are fully incorporated into the glass network and are coordinated by 78 Se atoms. However, when the DyCl3 dopant is present in concentrations ≥1000 ppmw Dy3+ the environment is dominated by DyCl bonds. Furthermore, these DyCl environments are nanocrystalline, retaining chemical order beyond the first coordination shell. By comparison with XRD and FTIR results, we report that the presence of α-Ga2Se3 crystallites in the glass, and the increased optical scattering in the fibres, are both related to the presence of DyCl3 crystallites.	Aug 2014
B22-Multimode InfraRed imaging And Microspectroscopy	Mid-infrared (IR) A hot topic: The potential for using mid-IR light for non-invasive early detection of skin cancer in vivo Angela Seddon Physica Status Solidi (b) 250 (5), 1020–-1027 DOI: 10.1002/pssb.201248524 Diamond Proposal Number(s): [7294, 8230, 8712] Show Abstract ▼ Abstract: After an introduction to the mid-infrared (IR) spectral region, the tremendous significance of mid-IR spectroscopic sensing is highlighted. The remarkable progress made towards mid-IR spectral in vitro mapping of tissue and cancer detection is reviewed, with emphasis on diagnosis of skin cancer. The status quo of chalcogenide glass mid-IR fibre optics and photonics for meeting opportunities for remote mid-IR sensing in general, and in in vivo cancer detection in particular, is assessed. Raman spectroscopy is a sister technique to mid-IR spectroscopy. The current success of Raman spectroscopy in medical diagnosis is appraised, with particular emphasis on Raman spectral imaging of tissue towards skin cancer diagnosis in vivo, based on a silica-glass fibreoptic sensor-head. The challenges to be met in chalcogenide glass science and technology towards facilitating analogous fibreoptic diagnostics based on mid-IR spectroscopy are addressed.	May 2013

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