EPJ D Highlight - Understanding the ionisation of proton-impacted helium

Calculating electron emission angles

Advanced mathematical analysis of the ionisation of a helium atom by an impacting proton has revealed where discrepancies arise between experiments and existing theoretical calculations of the process

When an atom is impacted by a fast-moving proton, one of its orbiting electrons may be knocked away, leaving behind a positively-charged ion. To understand this process, it is important for researchers to investigate distributions in the angles at which electrons travel when knocked away. In a new study published in EPJ D, M. Purkait and colleagues at Ramakrishna Mission Residential College in India have clearly identified particular areas where discrepancies arise between the angular distributions measured in theories and experiments.

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EPJ D Highlight - Uncovering fragmentation differences in chiral biomolecules

Different chiral forms of the dipeptide

By combining mass spectroscopy with further analytical and simulation techniques, researchers have revealed key differences in the fragmentation of dipeptide biomolecules with different chiral structures

‘Chirality’ describes the difference in structure between two molecules that are, or are close to being mirror images of each other. Although their chemical formulae are identical, these molecules have slightly different properties, making it useful for chemists to distinguish between them. The technique of ‘mass spectroscopy’ can provide detailed information about their complex molecular structures, but it is also blind to any differences between their chiral structures. In new research published in EPJ D, a team led by Anne Zehnacker at Paris-Saclay University combine mass spectroscopy with a range of other simulation and analytical techniques, allowing them to distinguish between two chiral forms of a dipeptide biomolecule.

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EPJ D Topical review - Review of experimental and theoretical research on positronium ions and molecules

Artist's view of the positronium negative ion and the positronium molecule.

The relativistic quantum theory developed by Dirac in the 1930’s is the cornerstone of Quantum Electrodynamics (QED), which has proved to be one of the most successful theories in physics. For example, measurements and QED calculations of the anomalous electron magnetic moment agree to 10 significant figures. Physicists now believe that QED can fully account for all effects that are mediated by electromagnetic interactions.

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EPJD has appointed new Editor-in-Chief Joachim Burgdörfer

Joachim Burgdörfer

It is with great pleasure that the publishers of European Physical Journal D: Atomic, Molecular, Optical and Plasma Physics can announce the appointment of Prof Dr Joachim Burgdörfer (Vienna University of Technology, Austria) as Editor-in-Chief, effective July 1. A long-standing member of the Editorial Board of EPJD, he succeeds Prof. Dr. Andrey V. Solov'yov, who steps down after almost 7 years in the EiC role.

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EPJD Colloquium - Challenges and opportunities in verification and validation of low temperature plasma simulations and experiments

In the field of plasma physics, simulations are becoming increasingly relied upon to elucidate fundamental plasma phenomena as well as to simulate real-world plasma reactors. This new colloquium published in EPJD provides a description of how one research group (at Sandia National Laboratories) incorporates verification and validation (V&V) processes in their low temperature plasma (LTP) research and development activities.

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EPJ D Colloquium - All-atom relativistic molecular dynamics simulations of channeling and radiation processes in oriented crystals

In a new Colloquium article published in EPJD, authors from the MBN Research Center (Frankfurt am Main, Germany) review achievements made recently in the field of numerical modeling of ultra-relativistic projectiles propagation in oriented crystals, radiation emission and related phenomena. This topic is highly relevant to the problem of designing novel gamma-ray light sources (LSs) based on the exposure of oriented crystals to the beams of charged particles. Crystal-based LSs can generate radiation in the photon energy range where the technologies based on the fields of permanent magnets become inefficient or incapable.

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EPJ D Highlight - Investigating dense plasmas with positron waves

Chaotic motions of travelling positron acoustic waves in the magnetoplasma system (Mouhammadoul. B. B., Tiofack. C. G. L., Alim. A., Mohamadous. A.)

Astrophysical and lab-created plasmas under the influence of magnetic fields are the source of intense study. New research seeks to understand the dynamics of position waves travelling through these clouds of highly ionised gas.

The investigation of Electron-Positron-Ion (EPI) plasma — a fully ionised gas of electrons and positrons that includes astrophysical plasmas like solar winds — has attracted a great deal of attention over the last twenty years. A new study published in EPJ D by Garston Tiofack, Faculty of Sciences, University of Marousa, Cameroon, and colleagues, assesses the dynamics of positron acoustic waves (PAWS) in EPI plasmas whilst under the influence of magnetic fields, or magnetoplasmas.

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EPJ D Topical review - A review of the gas and liquid phase interactions in low-temperature plasma jets used for biomedical applications

Atmospheric pressure plasma jets generated using noble gases have been the focus of intense investigation for over two decades due to their unique physicochemical properties and their suitability for treating living tissues to elicit a controlled biological response. Such devices enable the generation of a non-equilibrium plasma to be spatially separated from its downstream point of application, simultaneously providing inherent safety, stability and reactivity. Underpinning key plasma mediated biological applications are the reactive oxygen and nitrogen species (RONS) created when molecular gases interact with the noble gas plasma, yielding a complex yet highly reactive chemical mixture. The interplay between the plasma physics, fluid dynamics and plasma chemistry ultimately dictates the chemical composition of the RONS arriving at a biological target.

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EPJD has appointed new Editor-in-Chief Almut Beige

Almut Beige

The publishers of European Physical Journal D: Atomic, Molecular, Optical and Plasma Physics are delighted to announce the appointment of a new Editor-in-Chief, Dr Almut Beige, Head of the Theoretical Physics Group at the University of Leeds, UK, effective January 2021. She will be responsible for the fields of photonics, quantum optics and quantum information of the journal, and succeeds Prof Tommaso Calarco, who steps down after three years in this role.

Dr Almut Beige is an expert in Quantum Optics and Quantum Photonics. Since completing her PhD in Goettingen, she has been fascinated with the often very strange implications of quantum physics. Applications of her research range from quantum computing to quantum metrology and quantum sensing. She has been a member of the Editorial Board for EPJD since 2015.

EPJ D Highlight - Characterising cold fusion in 2D models

Mapping the probability of fusion

A new 2D modelling approach has been used to directly calculate how hydrogen nuclei fuse into helium after capturing muons

Progress towards ‘cold fusion,’ where nuclear fusion can occur at close to room temperatures, has now been at a standstill for decades. However, an increasing number of studies are now proposing that the reaction could be triggered more easily through a mechanism involving muons – elementary particles with the same charge as electrons, but with around 200 times their mass. Through a study published in EPJ D, researchers led by Francisco Caruso at the Brazilian Centre for Physical Research have shown theoretically how this process would unfold within 2D systems, without any need for approximations.

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ISSN: 2195-7045 (Electronic Edition)

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