1,721,012 research outputs found
Mechanism of Photoelectron Yield Enhancement from Ag Clusters
No full textLSELPRXUniv wisconsin,dept phys,stoughton,wi 53589. univ wisconsin,ctr synchrotron radiat,istoughton,wi 53589. Faraci, g, univ catania,departimento fis,ctr interuniv struttura mat,nazl struttura mat grp,corso italia 57,i-95129 catania,italy.ISI Document Delivery No.: AN03
Bonapartismo, una categoria discussa
No full textLa categoria di Bonapartismo è qui ri-discussa, anche alla luce di interventi recenti, attraverso un quadro comparativo con l'altra categoria che chiama in causa i due Napoleone, vale a dire Cesarismo. La tesi di fondo è che nella figura di Napoleone III prese forma il distacco dal lascito dello zio sotto la veste, però, di una continuità più volte esibita
Na Hyperoxidation States Studied by Core-Level Spectroscopy
No full textIn order to investigate the formation and the time evolution of Na oxidation states, a thin ayer 0 sodium was deposited on oxidized substrates and exposed to oxygen at 10(-9) Torr. In the Na 2p core-level spectrum, several chemically shifted components have been observed, denoting the presence of non-stoichiometric Na oxidation states, whose binding energy is substrate independent. Modification of these states, with oxygen exposure has been observed by detecting the increase in intensity of the corresponding shifted components and the consequent decrease of the clean features: the stationary configuration is reached in a time tau = 10(3) S.LSELPRXEcole polytech fed lausanne,inst phys appl,ch-1015 lausanne,switzerland. Faraci, g, univ catania,consorzio interuniv fis mat,dipartimento fis,corso italia 57,i-95129 catania,italy.ISI Document Delivery No.: NZ15
Na-Promoted Oxidation of Si - the Specific Oxidation Mechanism
No full textThe dramatic enhancement of the silicon room-temperature oxidation rate by a Na overlayer has been attributed to the spectator catalytic action of the alkali metal. In contrast, we show evidence that Na participates in the oxidation process binding an oxygen atom in a substoichiometric intermediate oxidation state. This causes preferential saturation of the semiconductor dangling bonds on the surface and a subsequent promotion of the oxide growth. We have, in fact, detected the Na 2p photoemission chemical shifts when bonds with an oxygen atom are established in a hybrid configuration.LSELPRXEcole polytech fed,inst phys appl,ph ecublens,ch-1015 lausanne,switzerland. Faraci, g, univ catania,dipartmento fis,consorzio interuniv fis mat,corso italia 57,i-95129 catania,italy.ISI Document Delivery No.: MV08
- …
