Encontrados 14 documentos, a visualizar página 1 de 2
Spin exchange of muonium in CdS
Gil, J. M.; Piroto Duarte, J.; Vilão, R. C.; Alberto, H. V.; Ayres de Campos, N.; Cox, S. F. J.http://www.sciencedirect.com/science/article/B6TVH-4V34D8T-7/2/3a955c2f8a5ab1c3fde448c9a1483077
Muonium in nano-crystalline II-VI semiconductors
Houtepen, A. J.; Gil, J. M.; Lord, J. S.; Liljeroth, P.; Vanmaekelbergh, D.; Alberto, H. V.; Vilão, R. C.; Piroto Duarte, J.; Ayres de Campos, N.http://www.sciencedirect.com/science/article/B6TVH-4V2NP2J-Y/2/3738c97c2d99528da5d86b4865717938
Delayed electron capture and Mu- formation in ZnSe
Vilão, R. C.; Gil, J. M.; Weidinger, A.; Alberto, H. V.; Piroto Duarte, J.; Costa, B. F. O.; Ayres de Campos, N.; Lichti, R. L.; Chow, K. H.http://www.sciencedirect.com/science/article/B6TVH-4V2NP2J-1R/2/ae8c94d2ee3229b6fe7881d93d1a64eb
Possible donor and acceptor energies for Mu in ZnSe
Lichti, R. L.; Carroll, B. R.; Vernon, J. E.; Bani-Salameh, H. N.; Chow, K. H.; Fan, I.; Egilmez, M.; Vilão, R. C.; Gil, J. M.; Alberto, H. V.http://www.sciencedirect.com/science/article/B6TVH-4V2NP2J-1G/2/9cc872ab4bb7b3920fd0a305f17d7708
Location of the H[+/-] level: Experimental limits for muonium
Lichti, R. L.; Chow, K. H.; Gil, J. M.; Stripe, D. L.; Vilão, R. C.; Cox, S. F. J.The defect energy levels for muonium, a light pseudo-isotope of hydrogen, are investigated to define the equivalent of the H[+/-] level which is predicted to be fixed at a universal energy. Existing results for Mu at donor and acceptor sites in silicon tentatively place Mu[+/-] approximately 0.5 eV above the predicted hydrogen level. Measured donor ionization energies in other materials in which two neutral Mu ...
Oxide muonics: A new compendium
Cox, S. F. J.; Lord, J. S.; Cottrell, S. P.; Gil, J. M.; Alberto, H. V.; Piroto Duarte, J.; Vilão, R. C.; Keeble, D. J.; Davis, E. A.; Keren, A.A new survey of muonium states brings the total of binary non-magnetic oxides studied to 30, with normal muonium--the interstitially trapped atomic state--found in 15 of these. The number of shallow-donor states of the type known in ZnO now also totals 15, but there are hints of several others. Tantalizingly, the shallow-donor and deep-atomic states are found to coexist in several of the candidate high-permitti...
Muonium diffusion dynamics in mercury oxide
Piroto Duarte, J.; Gil, J. M.; Alberto, H. V.; Vilão, R. C.; Weidinger, A.; Ayres de Campos, N.; Cox, S. F. J.; Lord, J. S.; Cottrell, S. P.The diffusion dynamics of the neutral muonium state found in HgO is addressed in this work. We propose a hopping model for the diffusion, and use it to analyse time-domain [mu]SR data. It is found that the diffusion is an incoherent quantum process, with an activation energy of 5.2(2) meV. The analysis also points to the anti-bonding site as the best-suited candidate for the muon's localisation. ; http://www...
Hyperfine Parameters for Muonium in Copper (I), Silver (I) and Cadmium Oxides
Cox, S.; Lord, J.; Cottrell, S.; Alberto, H.; Gil, J.; Piroto Duarte, J.; Vilão, R.; Keren, A.; Prabhakaran, D.Abstract Muonium centres in Cu2O, Ag2O and CdO show hyperfine parameters spanning four orders of magnitude. They exemplify the three different categories of hydrogen defect centre in semiconducting and dielectric solids, with very different electronic structure and electrical activity, namely quasi-atomic (possibly deep acceptor), deep donor and shallow donor. ; http://dx.doi.org/10.1007/s10751-005-9058-7
Muon diffusion and trapping in chalcopyrite semiconductors
Vilão, R. C.; Gil, J. M.; Alberto, H. V.; Duarte, J. Piroto; Campos, N. Ayres de; Weidinger, A.; Yakushev, M. V.; Cox, S. F. J.The diffusion parameters of diamagnetic muons in chalcopyrites CuInSe2, CuInS2, CuInTe2, CuGaTe2 and (Ag0.25Cu0.75)InSe2 were obtained by [mu]SR methods. The variations among the different compositions were found to validate the anion-antibonding localization model. The application of a two-state model to the zero-field data revealed muon trapping by defects. The dipolar width at the trap and the number of jump...
Probing the shallow-donor muonium wave function in ZnO and CdS via transferred ...
Lord, J. S.; Cottrell, S. P.; King, P. J. C.; Alberto, H. V.; Ayres de Campos, N.; Gil, J. M.; Duarte, J. Piroto; Vilão, R. C.; Lichti, R. L.The assignment of muon spin rotation spectra to muonium counterparts of hydrogen shallow-donor states is reviewed in four II-VI widegap semiconductors, CdS, CdSe, CdTe and ZnO. The existence of extended electronic orbitals is argued from the muon-electron hyperfine parameters and supported by the new muon spin repolarization data for CdS and ZnO, characterizing the superhyperfine parameters on the sparse Cd and...
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