The mass difference between H and D atoms seriously affects the tunneling rate, and the amount can be approximately estimated by eq 2. When the vibration between N and H/D atoms is assumed to be a harmonic oscillator, the mass effect for the line = 1 vibrational level of ND3 the amount of the factor (3) is about 6, so that the exponent factor amounts to 4.2. This value should be connected with the potential energy function, V(r), and a similar analysis for the 0® and l\ transitions can reveal details of the dissociation mechanism on the potential energy surface. The analysis for the 0q and transitions and an ab initio calculation are in progress in our group.
The nanometer-scale patterned pyramidal probe with an electron beam-induced nanopore on the pyramid apex is an excellent candidate for an optical biosensor. The nanoapertures surrounded with various periodic groove patterns on the pyramid sides were fabricated using a focused ion beam technique, where the optical characteristics of the fabricated apertures with rectangular, circular, and elliptical groove patterns were investigated. The elliptical groove patterns on the pyramid were designed to maintain an identical distance between the grooves and the apex for the surface waves and, among the three patterns, the authors observed the highest optical transmission from the elliptically patterned pyramidal probe. A 103-fold increase of the transmitted optical intensity was observed after patterning with elliptical grooves, even without an aperture on the pyramid apex. The nanopore on the apex of the pyramid was fabricated using electron beam irradiation and was optically characterized.
In this report, the authors will investigate the formation of Au clusters on the nanoscale membrane formed during various surface treatments such as electron beam irradiations, Ga ion focused ion beam (FIB) technique, and thermal treatment. Nanoapertures on the freestanding Au film were fabricated by using FIB technique, and a nanometer scale membrane created in the aperture by various surface treatments. Transmission electron microscopy reveals that Au clusters has formed on the membrane after the sample storage at room temperature for several months. In addition, Au clusters on the carbon-containing membrane were also observed after surface treatments of Ga ion beam etching, and thermal heating of freestanding 40 nm thick Au film at temperatures ranging from 400 to 800 C. Spinodal decomposition, spinodal dewetting, and coalescence of the Au particles on the carbon-containing membrane were also observed. V
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