Topical Issue on atomic cluster collisions

TOPICAL REVIEW Collisions near threshold in atomic and molecular physics

We review topics of current interest in the physics of electronic, atomic and molecular scattering in the vicinity of thresholds. Starting from phase space arguments, we discuss the modifications of the Wigner law that are required to deal with scattering by Coulomb, dipolar and dispersion potentials, as well as aspects of threshold behaviour observed in ultracold atomic collisions. We employ t...

Topical Issue: Acu-obesity and Diabetes.

Obesity hasbecomeamajorpublic health issueworldwide. It is a contributing factor in diabetes, cardiovascular disease, hypertension, stroke, cancer, osteoarthritis, asthma, and sleep apnea [1], and one of the components ofmetabolic syndrome. Metabolic syndrome is a state of chronic low-grade inflammation as a consequence of a complex interaction between genetic and environmental factors. It is c...

Multi-electron processes in atomic collisions ± theory

For the theoretical description of the multi-electron processes induced by charged particle impact we use a relatively simple perturbative method. The second-order approximation is valid for protons and antiprotons of moderate and high velocities. Electron correlation is taken into account by the use of con®guration-interaction wavefunctions. The agreement with the available experimental data f...

Ion-Atom Cold Collisions and Atomic Clocks

Atomic four-wave mixing via condensate collisions

We perform a theoretical analysis of atomic four-wave mixing via a collision of two Bose-Einstein condensates of metastable helium atoms. The analysis is based on first-principles quantum simulations using the positive P-representation method and is aimed at modeling recent experiments at Orsay [2]. Using the actual experimental parameters, we calculate atom-atom pair correlations within the s-...