Browsing by Author "Martin, C."

Now showing 1 - 3 of 3
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    Geometry-dependent electronic properties of highly fluorescent conjugated molecules
    Yang, S. C.; Graupner, W.; Guha, S.; Puschnig, P.; Martin, C.; Chandrasekhar, H. R.; Chandrasekhar, M.; Leising, G.; Ambrosch-Draxl, C.; Scherf, U. (American Physical Society, 2000-09-11)
    We present a combined experimental/theoretical study of the electronic properties of conjugated para-phenylene type molecules under high pressure up to 80 kbar. Pressure is used as a tool to vary the molecular geometry and intermolecular interaction. The influence of the latter two on singlet and triplet excitons as well as polarons is monitored via optical spectroscopy. We have performed bond structure calculations for the planar poly(para-phenylene) and calculated the dielectric function. By varying the intermolecular distances and the length of the polymer repeat unit the observed pressure effects can be explained.
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    Neutrinos from Stored Muons nuSTORM: Expression of Interest
    Adey, D.; Agarwalla, S. K.; Ankenbrandt, C. M.; Asfandiyarov, R.; Back, J. J.; Barker, G.; Baussan, E.; Bayes, R.; Bhadra, S.; Blackmore, V.; Blondel, A.; Bogacz, S. A.; Booth, C.; Boyd, S. B.; Bravar, A.; Brice, S. J.; Bross, A. D.; Cadoux, F.; Cease, H.; Cervera, A.; Cobb, J.; Colling, D.; Coney, L.; Dobbs, A.; Dobson, J.; Donini, A.; Dornan, P. J.; Dracos, M.; Dufour, F.; Edgecock, R.; Evans, J.; George, M. A.; Ghosh, T.; deGouvea, A.; Gomez-Cadenas, J. J.; Haesler, A.; Hanson, G.; Geelhoed, M.; Harrison, P. F.; Hartz, M.; Hernandez, P.; Hernando-Morata, J. A.; Hodgson, P. J.; Huber, Patrick; Izmaylov, A.; Karadhzov, Y.; Kobilarcik, T.; Kopp, J.; Kormos, L.; Korzenev, A.; Kurup, A.; Kuno, Y.; Kyberd, P.; Lagrange, J. P.; Laing, A. M.; Link, Jonathan M.; Liu, A.; Long, K. R.; McCauley, N.; McDonald, K. T.; Mahn, K.; Martin, C.; Martin, J.; Mena, O.; Mishra, S. R.; Mokhov, N.; Morfin, J.; Mori, Y.; Murray, W.; Neuffer, D.; Nichol, R.; Noah, E.; Palmer, M. A.; Parke, S.; Pascoli, S.; Pasternak, J.; Popovic, M.; Ratoff, P.; Ravonel, M.; Rayner, M.; Ricciardi, S.; Rogers, C.; Rubinov, P.; Santos, E.; Sato, A.; Scantamburlo, E.; Sedgbeer, J. K.; Smith, D. R.; Smith, P. J.; Sobczyk, J. T.; Söldner-Rembold, S.; Soler, F. J. P.; Sorel, M.; Stahl, A.; Stanco, L.; Stamoulis, P.; Striganov, S.; Tanaka, H.; Taylor, I. J.; Touramanis, C.; Tunnell, C. D.; Uchida, Y.; Vassilopoulos, N.; Wascko, M. O.; Weber, A.; Wildner, E.; Wilking, M. J.; Winter, W.; Yang, U. K. (2013-05)
    The nuSTORM facility has been designed to deliver beams of electron and muon neutrinos from the decay of a stored muon beam with a central momentum of 3.8 GeV/c and a momentum spread of 10%. The facility is unique in that it will: serve the future long- and short-baseline neutrino-oscillation programmes by providing definitive measurements of electron-neutrino- and muon-neutrino-nucleus cross sections with percent-level precision; allow searches for sterile neutrinos of exquisite sensitivity to be carried out; and constitute the essential first step in the incremental development of muon accelerators as a powerful new technique for particle physics. Of the world's proton-accelerator laboratories, only CERN and FNAL have the infrastructure required to mount nuSTORM. Since no siting decision has yet been taken, the purpose of this Expression of Interest (EoI) is to request the resources required to: investigate in detail how nuSTORM could be implemented at CERN; and develop options for decisive European contributions to the nuSTORM facility and experimental programme wherever the facility is sited. The EoI defines a two-year programme culminating in the delivery of a Technical Design Report.
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    Primary optical excitations and excited-state interaction energies in sexithiophene
    Loi, M. A.; Martin, C.; Chandrasekhar, H. R.; Chandrasekhar, M.; Graupner, W.; Garnier, F.; Mura, A.; Bongiovanni, G. (American Physical Society, 2002-09-11)
    Based on a unique combination of angle-resolved transmission spectroscopy and transmission data at high pressure, we identify the primary photoexcitations and the relevant excited-state interaction energies in a sexithiophene crystal. Optical excitations include charge-transfer excitons and Davydov polaritons. By extrapolation, we predict that in sexithiophene at hydrostatic pressures above 180 kbar, intermolecular excitations are lower in energy than intramolecular ones. The results are representative for a wide class of pi-conjugated molecular semiconductors because (1) the pertinent interaction energies and lengths scales are nearly identical and (2) published data on different molecules are consistent with our interpretation.