The availability of reliable and well-engineered commercial instruments and data analysis software has led to development in recent years of robust and ergonomic atom-probe tomographs. Indeed, atom-probe tomography (APT) is now being applied to a broader range of materials classes that involve highly important scientific and technological problems in materials science and engineering. Dual-beam...

Introduction: In March, 2006, the Hawaii Institute of Geophysics and Planetology expects to take delivery of a new Cameca ims 1280 ion microprobe. The new ion probe will be the centerpiece of the W. M. Keck Cosmochemistry Laboratory and will be used to analyze extraterrestrial materials, including meteorites, interplanetary dust particles (IDPs), and samples returned by NASA missions. The 1280 ...

A newly developed optical densitometry probe, and existing thermal wave, eddy current sheet resistance, and four-point GaAs sheet resistance probes were used to measure low dose Si+ ion implams. The four probes were evaluated for their ability to detect implant dose uniformity, their sensitivity to low doses, and their repeatability for multiple measurements on a single wafer, and on several wa...

A Faraday probe with three concentric rings was designed and fabricated to assess the effects of gap width and probe geometry in a systematic study of the Hall thruster plume. The nested Faraday probe consisted of two concentric collector rings and an outer guard ring, which enabled simultaneous current density measurements on the inner and outer collector. Two versions of the outer collector w...

* Presented as Paper IEPC-01-020 at the 27 International Electric Propulsion Conference, Pasadena, CA, 15-19 October 2001. † Copyright © 2001 by Richard Hofer. Published by the Electric Rocket Propulsion Society with permission. The effectiveness of collimated Faraday probes in obtaining the ion current density profile in Hall thrusters is investigated. A collimated probe design is attractive b...

A nonresonant femtosecond laser pulse centered at 802 nm is used to probe the real time photodissociation dynamics of CH(3)I in the A-band at 267 nm. Using multiphoton ionization with this probe laser pulse and velocity map ion imaging of CH(3)(+), we have followed the time evolution of the translational energy and spatial anisotropy of the CH(3) fragment, which in turn has permitted to image t...

A new multisignaling molecular probe DFDB was designed for the selective detection of Zn(2+). DFDB can be synthesized by a simple one-step reaction in high yield. Theoretical calculation suggests a novel sandwich structure of the DFDB·Zn(2+) complex.

Nanometer scale layered systems are well suited to investigate atomic transport processes induced by high-energy electronic excitations in materials, through the characterization of the interface transformation. In this study, we used the atom probe technique to determine the distribution of the different elements in a (amorphous-Fe2Tb 5 nm/hcp-Co 3 nm)20 multilayer before and after irradiation...