Zobrazeno 1 - 10
of 3 052
pro vyhledávání: '"Ramanathan C"'
Publikováno v:
Phys. Rev. B 98, 180405 (2018)
We use above-bandgap optical excitation, via a 1047 nm laser, to hyperpolarize the $^{31}$P spins in low-doped (N$_D =6\times10^{15}$ cm$^{-3}$) natural abundance silicon at 4.2 K and 6.7 T, and inductively detect the resulting NMR signal. The $30$ k
Externí odkaz:
http://arxiv.org/abs/1807.08746
Autor:
Ajoy, A., Nazaryan, R., Liu, K., Lv, X., Safvati, B., Wang, G., Druga, E., Reimer, J. A., Suter, D., Ramanathan, C., Meriles, C. A., Pines, A.
Dynamic Nuclear Polarization (DNP) has enabled enormous gains in magnetic resonance signals and led to vastly accelerated NMR/MRI imaging and spectroscopy. Unlike conventional cw-techniques, DNP methods that exploit the full electron spectrum are app
Externí odkaz:
http://arxiv.org/abs/1807.07664
Autor:
Sarrazin DH; Centre National de la Recherche Scientifique (CNRS), University of Strasbourg, Institute of Cellular and Integrative Neurosciences (INCI) UPR 3212, Strasbourg, France., Gardner W; Centre National de la Recherche Scientifique (CNRS), University of Strasbourg, Institute of Cellular and Integrative Neurosciences (INCI) UPR 3212, Strasbourg, France.; University of Strasbourg Institute for Advanced Study (USIAS), University of Strasbourg, Strasbourg, France., Marchese C; Centre National de la Recherche Scientifique (CNRS), University of Strasbourg, Institute of Cellular and Integrative Neurosciences (INCI) UPR 3212, Strasbourg, France.; University of Strasbourg Institute for Advanced Study (USIAS), University of Strasbourg, Strasbourg, France., Balzinger M; Centre National de la Recherche Scientifique (CNRS), University of Strasbourg, Institute of Cellular and Integrative Neurosciences (INCI) UPR 3212, Strasbourg, France.; University of Strasbourg Institute for Advanced Study (USIAS), University of Strasbourg, Strasbourg, France., Ramanathan C; Institute for Physiology I, University of Freiburg, Medical Faculty, Freiburg, Germany., Schott M; Centre National de la Recherche Scientifique (CNRS), University of Strasbourg, Institute of Cellular and Integrative Neurosciences (INCI) UPR 3212, Strasbourg, France., Rozov S; Laboratory of Neurotherapeutics, Drug Research Program, Division of Pharmacology and Pharmacotherapy, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland.; SleepWell Research Program, Faculty of Medicine, University of Helsinki, Helsinki, Finland., Veleanu M; Department of Psychiatry and Psychotherapy, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany., Vestring S; Department of Psychiatry and Psychotherapy, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.; Berta-Ottenstein-Programme for Clinician Scientists, Faculty of Medicine, University of Freiburg, Freiburg, Germany., Normann C; Department of Psychiatry and Psychotherapy, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany.; Center for Neuromodulation, Medical Center, Faculty of Medicine, University of Freiburg, Freiburg, Germany., Rantamäki T; Laboratory of Neurotherapeutics, Drug Research Program, Division of Pharmacology and Pharmacotherapy, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland.; SleepWell Research Program, Faculty of Medicine, University of Helsinki, Helsinki, Finland., Antoine B; Sorbonne Université, INSERM, Centre de Recherches St-Antoine (CRSA), Paris, France., Barrot M; Centre National de la Recherche Scientifique (CNRS), University of Strasbourg, Institute of Cellular and Integrative Neurosciences (INCI) UPR 3212, Strasbourg, France.; University of Strasbourg Institute for Advanced Study (USIAS), University of Strasbourg, Strasbourg, France., Challet E; Centre National de la Recherche Scientifique (CNRS), University of Strasbourg, Institute of Cellular and Integrative Neurosciences (INCI) UPR 3212, Strasbourg, France., Bourgin P; Centre National de la Recherche Scientifique (CNRS), University of Strasbourg, Institute of Cellular and Integrative Neurosciences (INCI) UPR 3212, Strasbourg, France.; CIRCSom (International Research Center for ChronoSomnology) & Sleep Disorders Center, Strasbourg University Hospital, Strasbourg, France., Serchov T; Centre National de la Recherche Scientifique (CNRS), University of Strasbourg, Institute of Cellular and Integrative Neurosciences (INCI) UPR 3212, Strasbourg, France. serchov@inci-cnrs.unistra.fr.; University of Strasbourg Institute for Advanced Study (USIAS), University of Strasbourg, Strasbourg, France. serchov@inci-cnrs.unistra.fr.; Department of Psychiatry and Psychotherapy, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany. serchov@inci-cnrs.unistra.fr.
Publikováno v:
Nature communications [Nat Commun] 2024 Aug 23; Vol. 15 (1), pp. 7257. Date of Electronic Publication: 2024 Aug 23.
Autor:
Gumann, P., Patange, O., Ramanathan, C., Haas, H., Moussa, O., Thewalt, M. L. W., Riemann, H., Abrosimov, N. V., Becker, P., Pohl, H. -J., Itoh, K. M., Cory, D. G.
Publikováno v:
Phys. Rev. Lett. 113, 267604 (2014)
We experimentally demonstrate the inductive readout of optically hyperpolarized phosphorus-31 donor nuclear spins in an isotopically enriched silicon-28 crystal. The concentration of phosphorus donors in the crystal was 1.5 x 10$^{15}$ cm$^{-3}$, thr
Externí odkaz:
http://arxiv.org/abs/1407.5352
Publikováno v:
Phys. Rev. B 87, 161306(R) (2013)
Direct dynamic nuclear polarization of 1H nuclei in frozen water and water-ethanol mixtures is demonstrated using silicon nanoparticles as the polarizing agent. Electron spins at dangling-bond sites near the silicon surface are identified as the sour
Externí odkaz:
http://arxiv.org/abs/1206.5125
Publikováno v:
Phys. Rev. B 84 035304 (2011)
We investigate the low-field relaxation of nuclear hyperpolarization in undoped and highly doped silicon microparticles at room temperature following removal from high field. For nominally undoped particles, two relaxation time scales are identified
Externí odkaz:
http://arxiv.org/abs/1103.3918
Autor:
Equbal A; Department of Chemistry, New York University Abu Dhabi, P.O. Box 129188, Abu Dhabi, United Arab Emirates.; Center for Quantum and Topological Systems, New York University Abu Dhabi, P.O. Box 129188, Abu Dhabi, United Arab Emirates., Ramanathan C; Department of Physics and Astronomy, Dartmouth College, Hanover, New Hampshire 03755, United States., Han S; Department of Chemistry and Biochemistry, University of California, Santa Barbara, Santa Barbara, California 93106, United States.; Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, California 93106, United States.
Publikováno v:
The journal of physical chemistry letters [J Phys Chem Lett] 2024 May 23; Vol. 15 (20), pp. 5397-5406. Date of Electronic Publication: 2024 May 13.
Autor:
Koch RE; Department of Biological Science, University of Tulsa, Tulsa, OK 74104, USA., Okegbe C; College of Health Sciences, University of Memphis, Memphis, TN 38152, USA., Ramanathan C; College of Health Sciences, University of Memphis, Memphis, TN 38152, USA., Zhu X; Department of Biological Sciences, Auburn University, Auburn, AL 36830, USA., Hare E; Department of Biological Sciences, Auburn University, Auburn, AL 36830, USA., Toomey MB; Department of Biological Science, University of Tulsa, Tulsa, OK 74104, USA., Hill GE; Department of Biological Sciences, Auburn University, Auburn, AL 36830, USA., Zhang Y; College of Health Sciences, University of Memphis, Memphis, TN 38152, USA.
Publikováno v:
The Journal of experimental biology [J Exp Biol] 2024 Apr 15; Vol. 227 (9). Date of Electronic Publication: 2024 May 10.
Autor:
Aptekar, J. W., Cassidy, M. C., Johnson, A. C., Barton, R. A., Lee, M. Y., Ogier, A. C., Vo, C., Anahtar, M. N., Ren, Y., Bhatia, S. N., Ramanathan, C., Cory, D. G., Hill, A. L., Mair, R. W., Rosen, M. S., Walsworth, R. L., Marcus, C. M.
Publikováno v:
ACS Nano 3, 4003 (2009)
Silicon nanoparticles are experimentally investigated as a potential hyperpolarized, targetable MRI imaging agent. Nuclear T_1 times at room temperature for a variety of Si nanoparticles are found to be remarkably long (10^2 to 10^4 s) - roughly cons
Externí odkaz:
http://arxiv.org/abs/0902.0269
Publikováno v:
Phys. Rev. Lett. 100, 127601 (2008)
We report record high Si-29 spin polarization obtained using dynamic nuclear polarization in microcrystalline silicon powder. Unpaired electrons in this silicon powder are due to dangling bonds in the amorphous region of this intrinsically heterogene
Externí odkaz:
http://arxiv.org/abs/0711.4076