Three-dimensional imaging of atomic four-body processes

  title={Three-dimensional imaging of atomic four-body processes},
  author={M. Schulz and Robert Moshammer and Daniel Fischer and Holger Kollmus and Don H. Madison and S. L. Jones and Joachim Ullrich},
To understand the physical processes that occur in nature we need to obtain a solid concept about the ‘fundamental’ forces acting between pairs of elementary particles. It is also necessary to describe the temporal and spatial evolution of many mutually interacting particles under the influence of these forces. This latter step, known as the few-body problem, remains an important unsolved problem in physics. Experiments involving atomic collisions represent a useful testing ground for studying… 


Fully differential studies of single ionization of neutral atoms by charged particle impact have proven to be extremely powerful to advance our understanding of the few-body dynamics in atomic

Three-dimensional cross sections for electron impact ionization of atoms and molecules

Using a multi-particle momentum spectrometer (reaction microscope), three-dimensional and fully differential cross sections (FDCS) for electron impact ionization are obtained, providing benchmark

High-Resolution Momentum Imaging—From Stern’s Molecular Beam Method to the COLTRIMS Reaction Microscope

Multi-particle momentum imaging experiments are now capable of providing detailed information on the properties and the dynamics of quantum systems in Atomic, Molecular and Photon (AMO) physics.

Complete photo-fragmentation of the deuterium molecule

The coincident measurement of the momenta of both nuclei and both electrons from the single-photon-induced fragmentation of the deuterium molecule reveals that the correlated motion of the electrons is strongly dependent on the inter-nuclear separation in the molecular ground state at the instant of photon absorption.

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

Recoil-ion and electron momentum spectroscopy is a rapidly developing technique that allows one to measure the vector momenta of several ions and electrons resulting from atomic or molecular

Two-particle versus three-particle interactions in single ionization of helium by ion impact

We have performed kinematically complete experiments on single ionization of He by 100 MeV amu−1 C6+ and 3.6 MeV amu−1 Au24,53+ impact. By analysing doubly differential cross sections (DDCS) as a

Kinematically complete experimental study of Compton scattering at helium atoms near the threshold

Compton scattering is one of the fundamental interaction processes of light with matter. When discovered 1 , it was described as a billiard-type collision of a photon ‘kicking’ a quasi-free electron.

Single and Multiple Ionization in Strong Ion-Induced Fields

This Chapter summarizes a wealth of recent results, obtained within less than a decade, on correlated few-particle quantum dynamics explored in the fragmentation of atoms being exposed to strong

Distorted Wave Theories Applied to Double Ionization by Ion Impact: Simulation of Higher-Order Processes

One of the goals in studies of double ionization (DI) of simple atoms by electron or ion impact is to elucidate and assess the different mechanisms that lead to this atomic process. In this work we



Differential cross sections of direct single electron impact ionization

The experimental and theoretical situations for direct single ionization by electron impact are reviewed with special emphasis on triple differential cross sections for impact energies between

Recoil-ion momentum spectroscopy

High-resolution recoil-ion momentum spectroscopy (RIMS) is a novel technique to determine the charge state and the complete final momentum vector of a recoiling target ion emerging from an ionizing

A quantum theory of ionisation in fast collisions between ions and atomic systems

Ionisation of atomic systems by fast ions is considered. A second-order quantum theory is derived which correctly accounts for all distortions of the initial- and final-state wavefunctions arising

Collisional breakup in a quantum system of three charged particles

A framework for solving ionization problems in many areas of chemistry and physics is finally provided by a mathematical transformation of the Schrodinger equation that makes the final state tractable, providing the key to a numerical solution of this problem that reveals its full dynamics.

Evidence of Initial-state Two-Center Effects for (e, 2e) Reactions

Coincidence, or (e, 2e), measurements of electron-impact ionization of atoms have established that the largest values of triply differential cross sections are obtained in collisions involving small

Ionisation of atoms by ion impact

Total cross sections are calculated for the ionisation of a hydrogen atom by multicharged fully-stripped ions in the 20-1000 keV amu-1 impact energy range. Distortion is accounted for in the entrance


Ionizing collisions of 114- and 50-eV electrons with helium have been studied by the measurement of the two outgoing electrons in coincidence as a function of the angle between them. At the same time

Second-order effects in (e, 2e) excitation-ionization of helium to ( n = 2)

First and second Born (e, 2e) calculations are presented for excitation-ionization of ground-state helium to . Results for ionization to the ground-state ion (1s) are also given. The physical content

Triply differential single ionization cross sections in coplanar and non-coplanar geometry for fast heavy ion-atom collisions

We have performed a kinematically complete experiment and calculations on single ionization in 100 MeV/amu C6+ + He collisions. For electrons ejected into the scattering plane (defined by the initial

Explicit demonstration of the convergence of the close-coupling method for a Coulomb three-body problem.

Convergence as a function of the number of states is studied and demonstrated for the Poet-Temkin model of electron-hydrogen scattering and shows that the often-encountered pseudoresonance features in the cross sections are simply an indication of an inadequate target state representation.