Low-temperature antihydrogen-atom scattering

Low-temperature antihydrogen-atom scattering

A simple method to include the strong force in atom–antiatom scattering is presented. It is based on the strong-force scattering length between the nucleon and antinucleon. Using this method elastic and annihilation cross sections are calculated for hydrogen–antihydrogen and helium–antihydrogen scattering. The results are compared to first-order perturbation theory using a pseudo potential. The...

Low-temperature atom formation in ultracold neutral plasmas

Scattering in tight atom waveguides

Using the Theory of Scattering in Restricted Geometries developed by A. Lupu-Sax as a starting point, we present a comprehensive multi-channel theory of atom-atom scattering in tight atom waveguides.

Observing atom motion by electron-atom Compton scattering

A very elemental method of observing the motion of the nucleus in molecules or solids is described. The observations for copper, graphite, and formvar films can be understood assuming that the electrons scatter from a moving target ~vibrating atoms!. The method is the complete electron analog for neutron Compton scattering. The nuclear motion causes a doppler shift in the energy of elastically ...

Similarity between positronium-atom and electron-atom scattering.

We employ the impulse approximation for a description of positronium-atom scattering. Our analysis and calculations of Ps-Kr and Ps-Ar collisions provide a theoretical explanation of the similarity between the cross sections for positronium scattering and electron scattering for a range of atomic and molecular targets observed by S. J. Brawley et al. [Science 330, 789 (2010)].