Coherence Length, Coherence Width and the Helium Atom Microscope

This paper is an accompaniment to the three reports on the Helium Atom Microscope, written in the years 1991 and 1992, which assess various designs scenarios for an atom microscope, anticipates their performance and identifies hurdles to overcome. It was written between 1991 and 1993 while the author was an Alexander von Humboldt Fellow, hosted by the Max Planck Institut für Strömungsforschung, Göttingen, and under the guidance of Professor J. P. Toennies, when together they were investigating the feasibility of building such a device.” This paper focuses on the concepts of coherence length and coherence width, both of which should be considered, when optimizing an atom microscope design

An improved double-toroidal spectrometer for gas phase (e,2e) studies

A new spectrometer is described for measuring the momentum distributions of scattered electrons arising from electron-atom and electron-molecule ionization experiments. It incorporates and builds on elements from a number of previous designs, namely, a source of polarized electrons and two high-efficiency electrostatic electron energy analyzers. The analyzers each comprise a seven-element retarding-electrostatic lens system, four toroidal-sector electrodes, and a fast position-and-time-sensitive two-dimensional delay-line detector. Results are presented for the electron-impact-induced ionization of helium and the elastic scattering of electrons from argon and helium which demonstrate that high levels of momentum resolution and data-collection efficiency are achieved. Problematic aspects regarding variations in collection efficiency over the accepted momentum phase space are addressed and a methodology for their correction presented. Principles behind the present design and previous designs for electrostatic analyzers based around electrodes of toroidal-sector geometry are discussed and a framework is provided for optimizing future devices.The assistance of the AustralianGerman Research Cooperation Scheme and the Australian Research Council through Grant No. DP0452553 and a 1998 ARC RIEF grant is gratefully acknowledged

Count Rate and the Helium Atom Microscope - Report 2

This, the second of three reports, written in the years 1991 and 1992, assesses various design scenarios for an atom microscope, anticipates their performance and identifies hurdles to overcome. The reports were written while the author was an Alexander von Humboldt Fellow, hosted by the Max Planck Institut für Strömungsforschung, Göttingen, and under the guidance of Professor J. P. Toennies, when together they were investigating the feasibility of building such a device

The Helium Atom Microscope - Report 1

This, the first of three reports, written in the years 1991 and 1992, assesses various design scenarios for an atom microscope, anticipates their performance and identifies hurdles to overcome. The reports were written while the author was an Alexander von Humboldt Fellow, hosted by the Max Planck Institut für Strömungsforschung, Göttingen, and under the guidance of Professor J. P. Toennies, when together they were investigating the feasibility of building such a device

The Helium Atom Microscope - Report 3

This, the third of three reports, written in the years 1991 and 1992, assesses various design scenarios for an atom microscope, anticipates their performance and identifies hurdles to overcome. The reports were written while the author was an Alexander von Humboldt Fellow, hosted by the Max Planck Institut für Strömungsforschung, Göttingen, and under the guidance of Professor J. P. Toennies, when together they were investigating the feasibility of building such a device

Otto Stern (1888-1969): The founding father of experimental atomic physics

We review the work and life of Otto Stern who developed the molecular beam technique and with its aid laid the foundations of experimental atomic physics. Among the key results of his research are: the experimental determination of the Maxwell-Boltzmann distribution of molecular velocities (1920), experimental demonstration of space quantization of angular momentum (1922), diffraction of matter waves comprised of atoms and molecules by crystals (1931) and the determination of the magnetic dipole moments of the proton and deuteron (1933).Comment: 39 pages, 8 figure

From research to safe practice on farms - the impact of research by the Australian Centre for Agricultural Health and Safety on policy and practice

Data compiled by the National Farm Injury Data Centre indicates a significant reduction in the number of farm deaths in the past 20 years. In the 1989-92 period there was an average of 146 deaths per year, while in the most recent period for which national data is available 2003-06, this has reduced to 82 deaths per year. In raw numbers, this represents a reduction of 44% over this period. Additionally, if measured in terms of deaths per 10,000 farms or per 100,000 employees over the same periods, there has been a 35% and 54% drop in respective death rates. The Centre with its active research program has been the key driver in national initiatives to reduce death rates in the agricultural population. This document summarizes the nature of the action research that has been undertaken by the Centre and how these results have been applied to enhance the health and safety of agricultural industries in Australia

Alcohol and Farm Workplace Project

Provides a review of literature in relation to the impact of alcohol on farm injury in an Australian setting. Outlines current data within NSW comparing alcohol use between farm and non-farm populationsAlcohol Education and Rehabilitation Foundatio