“By studying atoms with a negative charge, ‘negative ions’, we can learn how electrons coordinate their motion in what can be compared to a tightly choreographed dance. Such knowledge is important in understanding phenomena in which the interaction between electrons is important, such as in superconductors”, says Anton Lindahl of the Department of Physics at the University of Gothenburg.
A negative ion is an atom that has captured an extra electron, giving it a negative charge. Negative ions are formed, for example, when salt dissolves in water. We have many different types of negative ion in our bodies of which the most common is chloride ions. These are important in the fluid balance of the cells and the function of nervous system, among other processes.
Increased knowledge about negative ions may lead to a better understanding of our origin. This is because negative ions play an important role in the chemical reactions that take place in space, being highly significant in such processes as the formation of molecules from free atoms. These molecules may have been important building blocks in the origin of life.
“I have worked with ions in a vacuum, not in water as in the body. In order to be able to study the properties of individual ions, we isolate them in a vacuum chamber at extremely low pressure. This pressure is even lower than the pressure outside of the International Space Station, ISS.”
Anton Lindahl’s doctoral thesis describes studies in which he used laser spectroscopy to study how the electrons in negative ions interact.
“In order to be able to carry out these studies, I have had to develop measurement methods and build experimental equipment. The measurements that the new equipment makes possible will increase our understanding of the dance-like interplay.”
The new measurement methods that Anton has developed are important in a number of applications. One example is the measurement of trace substances in a technique known as ‘accelerator mass spectrometry’ or AMS. The technology and knowledge from Gothenburg are being used in a collaborative project between scientists in Gothenburg, Vienna (Austria) and Oak Ridge (USA) to increase the sensitivity of AMS measurements. One application of AMS is radiocarbon dating, which determines the age of organic matter. Another application is measurements on ice cores drilled from polar ice, which can be used to investigate the climate hundreds of thousands of years into the past.
The thesis Two-Electron Excitations in Negative Ions has been successfully defended at the University of Gothenburg. Supervisor: Dag Hanstorp.Bibliography:
Helena Aaberg | idw
Did you know that the wrapping of Easter eggs benefits from specialty light sources?
13.04.2017 | Heraeus Noblelight GmbH
To e-, or not to e-, the question for the exotic 'Si-III' phase of silicon
05.04.2017 | Carnegie Institution for Science
More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.
Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...
Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.
"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
20.04.2017 | Event News
18.04.2017 | Event News
03.04.2017 | Event News
27.04.2017 | Earth Sciences
27.04.2017 | Materials Sciences
27.04.2017 | Materials Sciences