(e,2e) Processes

Whelan, Colm T.

doi:10.1007/978-1-4615-4721-1_7

Cited by 4 publications

(2 citation statements)

References 40 publications

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“…In this letter, the fine details of atomic electron correlation are investigated through transferionization collisions. Information on correlation of target electrons from differential cross sections of single ionization, such as photo-ionization, Compton scattering or (e, 2e) ( Åberg 1976, Bergstrom et al 1993, Whelan 1999, Stefani 1999) is readily available. In recent times it has become clear that much detailed information on correlated target states can be found by studying double electron transitions.…”

mentioning

confidence: 99%

Fully differential cross sections for transfer ionization—a sensitive probe of high level correlation effects in atoms

Godunov¹,

Whelan²,

Walters³

2004

J. Phys. B: At. Mol. Opt. Phys.

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The transfer ionization process offers a unique opportunity to study radial and angular electron correlations in the helium atom. We report calculations for the multiple differential cross sections of the transfer ionization process p + He → H + He ++ + e −. The results of these calculations demonstrate the strong sensitivity of the fully differential cross sections to fine details of electron correlation in the target atom. Specifically, angular electron correlation in the ground state of helium results in a broad peak in the electron emission spectra in the backward direction, relative to the incoming beam. Our model explains some of the key effects observed in measurements of multiple differential cross sections using the COLTRIMS technique.

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mentioning

confidence: 99%

Fully differential cross sections for transfer ionization—a sensitive probe of high level correlation effects in atoms

Godunov¹,

Whelan²,

Walters³

2004

J. Phys. B: At. Mol. Opt. Phys.

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“…B = −B oẐ ) that points downs but we still fix the definition of our m = 3 , m = 4 and m = −4 to z-axis [64]. Figure 10 shows the graph of magnetic field created by a pair of Anti-Helmholz coils against z-axis.…”

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Nanometric surface probing through ultra-cold atoms

Khan¹,

Schaefer²,

Pernice³

et al. 2014

SPIE Proceedings

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In this thesis we simulate and design an experimental set up that is going to be used in many applications of applied physics and will give us many answer to unsolved puzzles. This experimental set up is going to feature for the first time the ability to interchange an atom chip frequently and rapidly. The setup also brings two emerging fields, ultracold atoms and nanophotonics, together on an optical table.First, we calculated and simulated the cold atom set-up. Then we simulated and designed an atom chip capable of bringing ultra-cold atoms to sub-micron distances to the chip surface. This new apparatus will present very first ideas on how to use the unique combination of cold atom technology with interchangeable photonics components, both, for basic research and for technological applications to modern information technologies. Furthermore, we can readily exchange the chip to test new components without the need for complicated high-vacuum procedures.The setup will be paired with photonic structures built on-chip for the detailed study of matter-light interactions and, e.g., a depth investigation of dispersion forces (the Casimir interaction and the van der Waals interaction) between cold atoms and carbon nanotubes, that can be measured by scanning probe microscopy. This will allow the integration of photonic waveguides atom chip and will open a new door for modern information technologies.Thesis effort is a joint venture project between the European Laboratory for Non-Linear Spectroscopy (LENS), Florence and the Karlsruhe Institute of Technology (KIT), Karlsruhe, and thrives to bring together experiences in cold atom physics and photonics.

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On the use of analytic ansatz three–body wave functions in the study of (e, 2e) band related processes

Lucey

Rasch

Whelan

1999

Proc. R. Soc. Lond. A

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We present a critical analysis of the analytic ansatz wave functions that have been proposed for use in the calculation of triple-differential cross-sections for the electronimpact ionization of atoms. We will first discuss, in detail, the mathematical background to these approximations, and we will give, for the first time, cross-sections for the electron-impact ionization of hydrogen using the most elaborate of these. We will show that they give generally unsatisfactory agreement with experiment. We will argue that this failure comes from an inability to model the crucial region where the three particles are close together. The analysis presented should be of value not only in the case of electron-impact ionization but also for a wide range of Coulombic three-body problems in atomic physics.

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(e,2e) Processes

Cited by 4 publications

References 40 publications

Fully differential cross sections for transfer ionization—a sensitive probe of high level correlation effects in atoms

Fully differential cross sections for transfer ionization—a sensitive probe of high level correlation effects in atoms

Nanometric surface probing through ultra-cold atoms

On the use of analytic ansatz three–body wave functions in the study of (e, 2e) band related processes

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