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51.
P. Monachesi R. Capelli R. Del Sole 《The European Physical Journal B - Condensed Matter and Complex Systems》2002,26(2):159-166
We calculate the optical functions of Pd using the ab initio, all-electron Full Potential Linear Muffin Tin Orbital method within the framework of the Density Functional Theory in the
Local Density approximation. We test, in the case of Pd, the convergence of the dielectric function and energy loss function
in different energy ranges vs. the completeness of the basis and give a quantitative estimate of the accuracy. The present approach opens the possibility
of extending the energy range where the optical functions can be calculated with good accuracy without increasing the computational
effort.
Received 4 September 2001 相似文献
52.
Melucci M Zambianchi M Favaretto L Gazzano M Zanelli A Monari M Capelli R Troisi S Toffanin S Muccini M 《Chemical communications (Cambridge, England)》2011,47(43):11840-11842
The design, synthesis and structure-property investigation of a new thienopyrrolyl dione substituted oligothiophene material showing reduced band gap energy, low lying LUMO energy level and ambipolar semiconducting behaviour is described. 相似文献
53.
Capelli L Crescenzi O Manini P Pezzella A Barone V d'Ischia M 《The Journal of organic chemistry》2011,76(11):4457-4466
5,6-Dihydroxyindole-based systems engender increasing interest for the design and implementation of new functional aromatic scaffolds and eumelanin-like materials with tailored absorption and electronic properties. However, studies aimed at elucidating the influence of external π-conjugating groups on the redox properties and acid-induced reactivity of these highly oxidizable indolic platforms are lacking. We report herein the synthesis (as acetyl derivatives) and chemical/quantum chemical characterization of the first π-extended 5,6-dihydroxyindole derivatives, 3-ethynyl-5,6-dihydroxyindole (1) and 3,3'-(1,2-ethynediyl)bis-5,6-dihydroxyindole (2), in order to understand whether and how β extension of the enamine-like pyrrole sector affects the absorption properties, redox behavior, and protonation equilibria at both the o-diphenol and quinone levels. Oxidation of 1 and 2 proceeded smoothly to generate dark insoluble materials with eumelanin-like UV properties. On exposure to phosphate buffer at pH 3, 1 was rapidly converted to 3-acetyl-5,6-dihydroxyindole (5) and, in the presence of 5,6-dihydroxyindole, to the cross-conjugated 3,3'-ethenylidenebis-5,6-dihydroxyindole (6). DFT calculations on 1 and 2 and their quinones in their pristine states and after protonation provided a mechanistic frame to rationalize the unusual acid-mediated chemistry of 1 and disclosed 2-quinone as the prototype of a novel class of medium-dependent chromophores. The ethynyl(ene) structural motif is thus proposed as the key to new tunable π-electron extended 5,6-dihydroxyindole/5,6-indolequinone paradigms for the rational design of alkyne-containing hybrid eumelanin-type polymers. 相似文献
54.
Stefano Toffanin Raffaella Capelli Wouter Koopman Gianluca Generali Susanna Cavallini Andrea Stefani Davide Saguatti Giampiero Ruani Michele Muccini 《Laser \u0026amp; Photonics Reviews》2013,7(6):1011-1019
Organic light‐emitting transistors (OLETs) are multifunctional optoelectronic devices that hold great promise for a variety of applications, including flat panel displays, integrated light sources for sensing and optical communication systems. The narrow illumination area within the device channel is considered intrinsic to the device architecture and is a severe technological drawback for all those applications where a controlled, wide and homogeneous emission area is required. Here it is shown that not only the position but also the extension of the emission area is voltage‐tunable, and the entire channel of the transistor can be homogeneously illuminated. The modeling of the exciton distribution within the channel at the different bias conditions coupled to the modeling of the device emission profile highlights that excitons are spread through the entire channel width and across the bulk of the central emission layer of the p‐channel/emitter/n‐channel trilayer active heterostructure. 相似文献
55.
C. Bucci S. Capelli M. Carrettoni M. Clemenza O. Cremonesi L. Gironi P. Gorla C. Maiano A. Nucciotti L. Pattavina M. Pavan M. Pedretti S. Pirro E. Previtali M. Sisti 《The European Physical Journal A - Hadrons and Nuclei》2009,41(2):155-168
Large-mass bolometers are today extensively used for dark matter and double beta decay searches, in both cases the ultimate
experimental sensitivity is defined by the background level reached in such devices. The most common background sources and
the techniques used for their identification and reduction are here reviewed, with a particular focus on double beta decay
searches. The relevant role played by Monte Carlo simulations in this field is discussed. As a real case, the background optimization
in the MiDBD experiment is described. 相似文献
56.
O. Azzolini M. T. Barrera J. W. Beeman F. Bellini M. Beretta M. Biassoni E. Bossio C. Brofferio C. Bucci L. Canonica S. Capelli L. Cardani P. Carniti N. Casali L. Cassina M. Clemenza O. Cremonesi A. Cruciani A. D’Addabbo I. Dafinei S. Di Domizio F. Ferroni L. Gironi A. Giuliani P. Gorla C. Gotti G. Keppel M. Martinez S. Morganti S. Nagorny M. Nastasi S. Nisi C. Nones D. Orlandi L. Pagnanini M. Pallavicini V. Palmieri L. Pattavina M. Pavan G. Pessina V. Pettinacci S. Pirro S. Pozzi E. Previtali A. Puiu C. Rusconi K. Schäffner C. Tomei M. Vignati A. Zolotarova 《The European Physical Journal C - Particles and Fields》2018,78(11):888
The CUPID-0 experiment searches for double beta decay using cryogenic calorimeters with double (heat and light) read-out. The detector, consisting of 24 ZnSe crystals 95\(\%\) enriched in \(^{82}\)Se and two natural ZnSe crystals, started data-taking in 2017 at Laboratori Nazionali del Gran Sasso. We present the search for the neutrino-less double beta decay of \(^{82}\)Se into the 0\(_1^+\), 2\(_1^+\) and 2\(_2^+\) excited states of \(^{82}\)Kr with an exposure of 5.74 kg\(\cdot \)yr (2.24\(\times \)10\(^{25}\) emitters\(\cdot \)yr). We found no evidence of the decays and set the most stringent limits on the widths of these processes: \(\varGamma \)(\(^{82}\)Se \(\rightarrow ^{82}\)Kr\(_{0_1^+}\))8.55\(\times \)10\(^{-24}\) yr\(^{-1}\), \(\varGamma \) (\(^{82}\) Se \(\rightarrow ^{82}\) Kr \(_{2_1^+}\))\(\,{<}\,6.25 \,{\times }\,10^{-24}\) yr\(^{-1}\), \(\varGamma \)(\(^{82}\)Se \(\rightarrow ^{82}\)Kr\(_{2_2^+}\))8.25\(\times \)10\(^{-24}\) yr\(^{-1}\) (90\(\%\) credible interval). 相似文献
57.
58.
59.
C. Arnaboldi D. R. Artusa F. T. Avignone III M. Balata I. Bandac M. Barucci J. Beeman C. Brofferio C. Bucci S. Capelli L. Carbone S. Cebrian O. Cremonesi R. J. Creswick A. de Waard H. A. Farach A. Fascilla E. Fiorini G. Frossati A. Giuliani P. Gorla E. E. Haller I. G. Irastorza R. J. McDonald A. Morales E. B. Norman A. Nucciotti E. Olivieri V. Palmieri E. Pasca M. Pavan M. Pedretti G. Pessina S. Pirro E. Previtali C. Pobes M. Pyle L. Risegari C. Rosenfeld M. Sisti A. R. Smith L. Torres G. Ventura 《Physics of Atomic Nuclei》2004,67(6):1220-1226
The CUORICINO ββ-decay detector is an array of 62 TeO2 bolometers; 44 are 5×5×5-cm crystals made with natural tellurium (33.8% 130Te). There are 18, 3×3×6-cm crystals, 14 of which are made of natural tellurium, 2 are isotopically enriched to 75% in 130Te, and 2 are enriched to 82.3% in 128Te. The total mass of 130Te is ~ 11 kg. The background rate is 0.23 ± 0.04 counts/keV/kg/yr in the energy interval 2480 to 2600 keV. During the cooling process, some of the wires became disconnected and only 32 of the large and 16 of the smaller crystals could be read out. The data presented here come from 29 of the 5×5×5-cm crystals containing 6.2 kg of 130Te. The new limit on the half-life is $T_{{1 \mathord{\left/ {\vphantom {1 2}} \right. \kern-0em} 2}}^{0\nu } \geqslant 5 \times 10^{23} yr$ , corresponding to an effective Majorana mass of the electron neutrino 〈m ν〉 between 0.42 and 2.05 eV, depending on the nuclear model used to analyze the data. 相似文献
60.
Arnaboldi C Artusa DR Avignone FT Balata M Bandac I Barucci M Beeman JW Brofferio C Bucci C Capelli S Carbone L Cebrian S Cremonesi O Creswick RJ de Waard A Farach HA Fiorini E Frossati G Guardincerri E Giuliani A Gorla P Haller EE McDonald RJ Morales A Norman EB Nucciotti A Olivieri E Pallavicini M Palmieri E Pasca E Pavan M Pedretti M Pessina G Pirro S Previtali E Risegari L Rosenfeld C Sangiorgio S Sisti M Smith AR Torres L Ventura G 《Physical review letters》2005,95(14):142501
We report the present results of CUORICINO, a search for neutrinoless double-beta (0nu betabeta) decay of 130Te. The detector is an array of 62 TeO2 bolometers with a total active mass of 40.7 kg. The array is cooled by a dilution refrigerator shielded from environmental radioactivity and energetic neutrons, operated at approximately 8 mK in the Gran Sasso Underground Laboratory. No evidence for (0nu betabeta) decay was found and a new lower limit, T(1/2)(0nu) > or = 1.8 x 10(24) yr (90% C.L.) is set, corresponding to [m(nu)] < or = 0.2 to 1.1 eV, depending on the theoretical nuclear matrix elements used in the analysis. 相似文献