[en] This work describes the construction of a EPR cavity with tunable resonance frequency and coupling, particularly designed for double electron-nucleus resonance such as ENDOR and Dnp

[en] We study entanglement dynamics of two and three atoms stored in a common nonperfect cavity together with some other nonentangled atoms. It is guessed at first thought that the presence of nonentangled atoms would favor the decoherence process of the interested entangled atoms. We show, on the contrary, that it is not so. Namely, as results of a rigorous nonperturbative analysis, disentanglement rate of the interested atoms decreases with the increase of the number of nonentangled atoms. If the number of nonentangled atoms is sufficiently large, the entanglement of interested atoms could be protected efficiently.

[en] Scientific measurements of sound generation and radiation by musical instruments are surprisingly hard to correlate with the subtle and complex judgments of instrumental quality made by expert musicians

[en] A mathematical model to describe the NMR processes is presented. In this model the influence of radiation attenuation on the relaxation time is taken into account

[en] Micromechanical sensing of magnetic force was used to detect nuclear magnetic resonance with exceptional sensitivity and spatial resolution. With a 900 angstrom thick silicon nitride cantilever capable of detecting subfemtonewton forces, a single shot sensitivity of 1.6 x 10¹³ protons was achieved for an ammonium nitrate sample mounted on the cantilever. A nearby millimeter-size iron particle produced a 600 tesla per meter magnetic field gradient, resulting in a spatial resolution of 2.6 micrometers in one dimension. These results suggest that magnetic force sensing is a viable approach for enhancing the sensitivity and spatial resolution of nuclear magnetic resonance microimaging

No abstract available

[en] We suggest to improve the ECR beam optic qualities by taking into account some studies made on other kind of ions sources

[en] Electron spin resonance (ESR) dating can be applied to a wide range of materials and has probably the largest potential amongst the dating techniques for the Quaternary. The dating procedure is very complex and many problems have to be addressed before this method can be regarded as a routine dating technique. This contribution gives a short introduction to ESR dating and tries to outline the specific advantages of this dating method, but also give a very personal opinion about the problems that need attention. It focuses on the actual ESR part of the dating procedure: signal definition and accumulated dose estimation. (author)

[en] Published in summary form only

[en] In this letter, we describe a unique method of producing hyperthermal neutrals for material processing. The hyperthermal neutrals are produced by accelerating ions across a sheath from a plasma onto a surface. On impact, the ions are neutralized and reflected with ∼50% of their incident energy. These neutrals then bounce off of additional surfaces prior to impacting the target. This unique multiple bounce system was developed for the following reasons: to reduce contamination from sputtered surface material, improve beam uniformity, and reduce UV radiation in the beam path. As a test of this method, we built a prototype beam source and used it to ash photoresist at rates up to 0.022 μm/min. These rates are consistent with a predicted neutral beam flux, 2x10¹⁴cm^-2s^-1. In addition, a simple model is used to indicate that this method is capable of producing economically acceptable ash rates. Comparisons with other neutral-beam production methods are made. copyright 1997 American Institute of Physics