Filaments composed of multilayered carbon hollow capsules less than 10nm in diameter have been synthesized from crystalline whiskers of fullerene C60 of submicrometer in diameter by preliminary heating at 1373K and successive impression of current. The structural, electrical and optical properties of the filaments were studied by in situ transmission electron microscopy combined with the functions of scanning probe microscopy. We found that the filaments easily emit visible light at a maximum wavelength of 700-730 nm by the application of a few volts.

A review of the random magnetic impurity model, introduced in the context of the quantum Hall effect, is presented. It models an electron moving in a plane and coupled to random Aharonov-Bohm vortices carrying a fraction of the flux quantum. Recent results on its perturbative expansion are given. In particular, some peculiar families of integrals turn out to be related to the Riemann ζ(3) and ζ(2).

We have analyzed the photochemical reaction for the deposition of SiO2 thin films at room temperature in photo-CVD using a vacuum ultraviolet (VUV) excimer lamp with reflection-absorption spectroscopy using a Fourier transform infrared spectrometer (RAS-FTIR). Tetraethoxyorthosilicate (TEOS) was used as a precursor and two types of excimer lamps were used as light sources. The reaction in VUV-CVD is divided into two stages: the reaction in the vapor phase, and the reaction on the surface of the substrate. In this work, we analyzed the latter stage. As a result of analyzing the spectra obtained, it was found that the main reaction for the formation of the SiO2 film was in the latter stage, in which the dissociation of Si–O bonds in Si–O–CH2 in the adsorbed fragments was preceded by the photo-dissociation of C2H5.

No abstract

Energetic ions having a maximum velocity of the order of 107 cm/s were detected in the interaction of a frequency-doubled Q-switched Nd:YAG laser with rare-gas cryogenic targets at the laser intensity of 1 ×1012 W/cm2. It was observed that the angular distribution of ions strongly peaked in the target normal direction confined to a narrow range of angle following ∼cos pθ ( p=3–5). Scaling of the ion current and their velocity as a function of an incident laser energy were investigated. To analyze the effect of energetic particles from a plasma, a silicon substrate was used as a particle target. Its surface morphology revealed that micron-size solid fragments from the target dominantly affected the silicon surface.