Energy spectrum of isomer no. 3 of C82 fullerene of C 2 symmetry

Physics of the Solid State - The energy spectrum of C82 fullerene (isomer no. 3 of C 2 symmetry) is calculated within the Hubbard model in the approximation of static fluctuations. Based on the...     

微处理器80C86及其外围芯片协合效应实验研究

研究了总剂量辐照对微处理器 80C86及其外围芯片82C85单粒子效应敏感度的影响.252Cf轰击 80C86获得的单粒子效应截面在0-12 0Gy(Si)剂量范围内没有明显的变化 ;外围芯片 82C85中发生的单粒子脉冲可能引起系统故障. Total dose dependence of the single event effct (SEE) sensitivity for microprocessor 80C86 and its peripheral chip 82C85 are reported. In this study, 1 μCi 252 Cf was used as a heavy ion simulator and the samples were tested by a patent 8086 test system following exposure to 60 Co γ rays. It is found that SEE cross section of 80C86 does not show significant change with increasing total dose from 0-120 Gy(Si). SEE test also shows that single event transient (SET) in 82C85...     

Photophysics of Semiconductor Polymer Nanocomposite with Fullerene C60 and Endohedral Metallofullerene Ho@C82

Physics of the Solid State - The photoexcitation energy transfer in donor–acceptor (DA) systems formed from a mixture of semiconductor polymer...     

The electronic state of scandium trimer encapsulated in a C82 cage

The electron spin resonance spectrum of scandium trimer encapsulated in a C₈₂ cage (Sc₃@C₈₂) was measured at low temperatures. The spectrum exhibited a specific pattern due to the strongly anisotropic hyperfine tensor of the scandium trimer. The electronic state of the Sc₃@C₈₂ was determined from an analysis of the hyperfine tensor.     

Hyperfeinstruktur des 82P3/2-Terms von Cäsium 134

The electric quadrupole interaction constantB of the 8p²P_3/2 state of Cs¹³⁴ has been determined by an optical double resonance measurement of the hyperfine structure transition v_F=11/2?F=9/2=47.84(12) Mc/s. The results are: B _8P ¹³⁴ =8.06(20) Mc/s and Q _8P ¹³⁴ =+ 0.427(8) · 10^?24cm². Comparison is made between the measurements in the 7p and 8p electronic states: Q _8P ¹³⁴ /Q _7P ¹³⁴ =0.977(20). The ratio of the corresponding Sternheimer correction factors yields the value C_7p/C_8P=0.982.     

Theoretical study on the sequential hydroxylation of C82 fullerene based on Fukui function

In the present work semi-empirical PM3 method and ab initio density-functional theory calculations were performed in carbon systems. The condensed Fukui function was calculated and HOMO–LUMO were visualised in order to study the sequence of hydroxylation of two isomers of C₈₂ fullerene for the low coverage regime, with the formula C₈₂(OH) _x where x?=?0???12. It was found that there was a formation of dangling bonds on structures with an odd number of hydroxyl groups on the fullerene surface, which suggests an enhanced reactivity of these molecules. Nevertheless, the coverings with an even number of groups tend to the reconstruction of π bonds, obtaining less reactive molecular structures. With the adsorption of the first group, a narrow HOMO–LUMO gap (1.28?eV) is observed in comparison with the C₈₂(OH)₂ system (1.70?eV), as is found in similar systems, such as C₆₀ fullerenol [E.E. Fileti et al., Nanotechnology 19, 365703 (2008); J.G. Rodríguez-Zavala and R.A. Guirado-López, Phys. Rev. B 69, 075411 (2004)]. Through an analysis of the electronic structure to these coverings, a splitting of electronic energy levels in the structure with one hydroxyl group is observed, which could be one of the factors that causes the narrowing of the energy gap in this structure. On the other hand, with a coverage of 12 hydroxyl groups, the formation of an amphiphilic molecule, where the location of groups in one side of the C₈₂ surface provides an hydrophilic character, is observed, while the uncovered part has an hydrophobic character. This could be important in the formation of Langmuir monolayers. Finally, it is shown that the precise distribution of the OH groups on the fullerene surface plays a crucial role in the electronic structure of the polyhydroxylated fullerenes.     

Disaccomodation phenomenon in Fe82B18-xCx and Fe82B18-xSix metallic glasses

The isochronal disaccomodation (DA) of the initial permeability was measured in Fe₈₂B_18-xC_x and Fe₈₂B_18-xSi_x metallic glasses in the temperature range from 77 to 600 K. An asymmetric isochronal spectrum with a single relaxation peak was observed on each studied glassy alloy. The peak shifts to the lower temperature side with increasing C content in Fe₈₂B_18-xC_x, whereas the influence of Si on the peak in Fe₈₂B_18-xSi_x is opposite to the effect of C. The kinet ic behavior of DA was examined and the activation energy spectrum was evaluated. The replacement of B by C gives rise to the reduction of the activation energy, whereas the addition of Si increases the energy. A clearly annealing effect on DA was observed on each examined alloy.     

Renormalized proton- neutron QRPA and double beta decay of 82Se to excited states in 82Kr

We apply the self-consistent renormalized proton-neutron QRPA (RQRPA) method to calculate the two-neutrino double beta (2νββ) decay matrix elements associated with the ground-state and excited-state transitions of the ⁸²Se → ⁸²Kr decay. The RQRPA method is an extension of the pnQRPA method and promotes the Pauli exclusion principle violated by the pnQRPA ground state and yields more stable nuclear matrix elements with increasing strength of the proton-neutron interaction. In the present work the RQRPA wave functions are also used to evaluate 2νββ-decay rates to excited final states. The resulting theoretical half lives are compared with the new stringent experimental limits obtained by using a HPGe detector and external sources of enriched selenium.     

Yrast states in81Br and82Br

Projectile and targetK-vacancy production probabilities in 4.6-, 5.8- and 7.3-MeV/a.m.u. U+U and U+Pb collisions are reported for impact parameters between 10 and 85 fm. These probability measurements are compared with available theory.