We report a study of the oxidation of CO on a gold nanotip in the presence of high electrostatic fields. With the binding energies obtained using density functional theory as a function of the electric field, a simple field-dependent kinetic model based on the Langmuir-Hinshelwood mechanism is set up. We show that the dissociative adsorption of oxygen on gold happens only below a negative criti...

We report on a substantial increase in the acceleration potential achieved with a LiTaO3 pyroelectric crystal. With a single 2.5 cm diameter and 2.5 cm long z-cut crystal without electric field-enhancing nanotip we produced positive ion beams with maximal energies between 300 and 310 keV during the cooling phase when the crystal was exposed to 5 mTorr of deuterium gas. These values are about a ...

We present the design and fabrication of a micrometer-scale electron gun for the implementation of ultrafast low-energy electron diffraction from surfaces. A multi-step process involving photolithography and focused-ion-beam nanostructuring is used to assemble and electrically contact the photoelectron gun, which consists of a nanotip photocathode in a Schottky geometry and an einzel lens for b...

Relentless efforts in semiconductor technology have driven nanometer-scale miniaturization of transistors, diodes, and interconnections in electronic chips. Free-space writing enables interconnections of stacked modules separated by an arbitrary distance, leading to ultimate integration of electronics. We have developed a free-space method for nanometer-scale wiring on the basis of manipulating...

BACKGROUND A one-parameter model was previously proposed to characterize the short axis motion of the LV wall at the mid-ventricle level. The single parameter of this model was associated with the radial contraction of myocardium, but more comprehensive model was needed to account for the rotation at the apex and base levels. The current study developed such model and demonstrated its merits an...

Since atomic force microscopy (AFM) images are a composite of probe and sample geometry, accurate size determinationsareproblematic. A relatively straightforwardmathematical procedure for determining tip radius of curvature (RT) for an asymmetrical tip was recently developed by Garcia et al. (ProbeMicrosc. 1997, 1, 107). This study represents an experimental test of that procedure for both sili...

We present observations of the Sunyaev-Zel’dovich effect (SZE) in the Bullet cluster (1E 0657–56) using the APEX-SZ instrument at 150 GHz with a resolution of 1′. The main results are maps of the SZE in this massive, merging galaxy cluster. The cluster is detected with 23σ significance within the central 1′ radius of the source position. The SZE map has a broadly similar morphology to that in e...

Related Articles Near-field optical imaging with a nanotip grown on fibered polymer microlens Appl. Phys. Lett. 100, 033107 (2012) Surface enhanced Raman spectroscopy by interfered femtosecond laser created nanostructures Appl. Phys. Lett. 100, 023107 (2012) Enhanced upconversion fluorescence of Er3+:ZrO2 nanocrystals induced by phase transformation AIP Advances 2, 012102 (2012) Formation mecha...