Events - today, tomorrow ... soon Highlights and News
today: 2017/02/23
Seminar room 3.11, building C, 14:00 h   Prof. Dr. Heather C. Allen
Ohio State University, Department of Chemistry and Biochemistry
Organization, Hydration, Ion Binding, and Inherent Electric Fields at Aqueous Surfaces
8 February 2017: Lattice of nanotraps and line narrowing in Raman gas
Decreasing the emission linewidth from a molecule is one of the key aims in precision spectroscopy. One approach is based on cooling molecules to near absolute zero. An alternative way is to localize the molecules on subwavelength scale. A novel approach in this direction uses a standing wave in a gas-filled hollow fibre. It creates an array of deep, nanometer-scale traps for Raman-active molecules, resulting inlinewidth narrowing by a factor of 10 000. ...more.
1st February 2017: Ultrasmall atom motions recorded with ultrashort x-ray pulses
Periodic motions of atoms over a length of a billionth of a millionth of a meter (10-15 m) are mapped by ultrashort x-ray pulses. In a novel type of experiment, regularly arranged atoms in a crystal are set into vibration by a laser pulse and a sequence of snapshots is generated via changes of x-ray absorption. ...more.
5 January 2017: Unified time and frequency picture of ultrafast atomic excitation in strong fields
The insight that light sometimes needs to be treated as an electromagnetic wave and sometimes as a stream of energy quanta called photons is as old as quantum physics. In the case of interaction of strong laser fields with atoms the dualism finds its analogue in the intuitive pictures used to explain ionization and excitation: The multiphoton picture and the tunneling picture. In a combined experimental and theoretical study on ultrafast excitation of atoms in intense short pulse laser fields scientists of the Max Born Institute succeeded to show that the prevailing and seemingly disparate intuitive pictures usually used to describe interaction of atoms with intense laser fields can be ascribed to a single nonlinear process. Moreover, they show how the two pictures can be united. The work appeared in the journal Physical Review Letters and has been chosen to be an Editors' suggestion for its particular importance, innovation and broad appeal. Beside the fundamental aspects the work opens new pathways to determine laser intensities with high precision and to control coherent Rydberg population by the laser intensity. ...more.
5 January 2017: Amplification of relativistic Electron Pulses by Direct Laser Field Acceleration
Controlled direct acceleration of electrons in very strong laser fields can offer a path towards ultra-compact accelerators. Such a direct acceleration requires rectification and decoupling of the oscillating electromagnetic laser field from the electrons in a suitable way. Researchers worldwide try to tackle this challenge. In experiments at the Max Born Institute, direct laser acceleration of electrons could now be demonstrated and understood in detail theoretically. This concept is an important step towards the creation of relativistic and ultra-short electron pulses within very short acceleration distances below one millimeter. Resulting compact electron and related x-ray sources have a broad spectrum of applications in spectroscopy, structural analysis, biomedical sciences and for nanotechnology. ...more.
23rd November 2016: At its annual meeting the Leibniz Association in Berlin awarded physicist Maria Richter for her outstanding doctoral thesis.
At its annual meeting the Leibniz Association in Berlin awarded physicist Maria Richter for her outstanding doctoral theses. Dr. Maria Richter developed in her PhD thesis "Imaging and controlling electronic and nuclear dynamics in strong laser fields" new theoretical and practical methods to visualize the ultrafast response of atoms and molecules to strong laser fields. ...more.
12 October 2016: Ocean rogue waves: a mystery unveiled?
Rogue waves are extremely high ocean waves that exceed the significant wave height by more than a factor of 2. Extreme waves are also very rare; less than one in 100,000 waves exceeds the rogue wave criterion. While their existence was long disputed throughout the 1990s, thousands of rogue waves have been recorded on oil rigs in the past 20 years. Nevertheless, the origin of rogue waves is still disputed, with a multitude of competing theories. These theories fall into two basic categories: linear theories consider incidental random interference the origin of rogue waves. ...more.
23rd September 2016: Benjamin Fingerhut is the winner of the 2016 Robin Hochstrasser Young Investigator Award
Dr. Benjamin Fingerhut, junior group leader at the Max Born Institute (MBI) receives the 2016 Robin Hochstrasser Young Investigator Award. The award is granted by an international scientific committee, consisting of members of the editorial board of the journal Chemical Physics, in order to support excellent early career researchers. ...more.
1st September 2016: Quantum Friction: Beyond the local equilibrium approximation
Systems out of thermodynamic equilibrium are very common in nature. In recent years they have attracted constantly growing attention because of their relevance for fundamental physics as well as for modern nanotechnology. In a collaborative effort, the Theoretical Optics and Photonics group at the Max-Born-Institut and Humboldt-Universität zu Berlin together with colleagues from the Universität Potsdam, Yale University and the Los Alamos National Laboratory now report on detailed new physical insights of non-equilibrium atom-surface quantum friction. ...more.
28th July 2016: Ultrastrong, ultrafast and local: water induces electric fields at the surface of DNA
The structure and dynamics of the DNA double helix are influenced in a decisive way by the surrounding water shell. New experiments in the ultrafast time domain show that the first two water layers at the DNA surface generate electric fields of up to 100 megavolts/cm which fluctuate on the femtosecond time scale and are limited to a spatial range on the order of 1 nm. ...more.
6th July 2016: Attosecond Science opens new Avenues in Femtochemistry
Attosecond Science is a new exciting frontier in contemporary physics, aimed at time-resolving the motion of electrons in atoms, molecules and solids on their natural timescale. Electronic dynamics derives from the creation and evolution of coherence between different electronic states and proceeds on sub-femtosecond timescales. In contrast, chemical dynamics involves position changes of atomic centers and functional groups and typically proceeds on a slower, femtosecond timescale inherent to nuclear motion. ...more.
4th July 2016: Fluctuating liquid structure induces ultrabroad infrared absorption: The hydrated proton on ultrafast time scales
The elusive infrared absorption continuum of protons in aqueous environment has been topic of intense controversial debate since half a century. A team of scientists from the Max Born Institute and the Ben Gurion University of the Negev, Israel, show for the case of the Zundel cation (H2O...H+...OH2) H5O2+ that the surrounding liquid induces fluctuating electrical forces onto the proton, modulating its vibrational motions between the two water molecules. This mechanism, together with low-frequency thermal motions, results in the extreme broadening of the infrared spectrum. ...more.
30th June 2016: Dr. Olga Smirnova installed as Professor at the Technical University Berlin
The Technical University Berlin has installed Dr. Olga Smirnova as a Professor for "Theoretical Physics with a Focus on Atomic and Molecular Laser Physics" on 30 June 2016. The S-Professorship is anchored in the Institute for Optics and Atomic Physics on the TU. ... more.
13th June 2016: Spin polarization by strong field ionization
Strong field ionization has been studied for over half a century. Yet, the role of electron spin during this process has been largely overlooked. Surprisingly, our joint experimental and theoretical study shows that a chance of detaching spin-up or spin-down electron from an atom can be very different ...more.
28th April 2016: Quantum Swing - a pendulum that moves forward and backwards at the same time
Two-quantum oscillations of atoms in a semiconductor crystal are excited by ultrashort terahertz pulses. The terahertz waves radiated from the moving atoms are analyzed by a novel time-resolving method and demonstrate the non-classical character of large-amplitude atomic motions.. ...more.
22nd April 2016: Ultrafast photoelectron imaging grasps competition in molecular autoionization
Using time-, energy- and angular-resolved photoelectron imaging a team of researchers from the Max Born Institute in Berlin, in collaboration with colleagues from Milan and Padova, has been able to make snapshots of coupled Rydberg orbitals evolving in time during an ultrafast autoionization process.. ...more.
8th March 2016: Thomas Elsaesser is the 2016 recipient of the Ellis R. Lippincott Award
Thomas Elsaesser, Director at the Max-Born-Institute and Professor for Experimental Physics at Humboldt University, Berlin, receives the Ellis R. Lippincott Award for his "seminal contributions to the understanding of the ultrafast coherent and incoherent vibrational dynamics of hydrogen bonds in liquids and biomolecules". ...more.
18th February 2016: Amplification of Sound Waves at Extreme Frequencies
An electric current through a semiconductor nanostructure amplifies sound waves at ultrahigh frequency. This method allows for novel, highly compact sources of ultrasound, which can serve as diagnostic tool for imaging materials and biological structures with very high spatial resolution. ...more.
19th January 2016: Invisible light flash ignites nano-fireworks
A team of researchers from the Max Born Institute in Berlin and the University of Rostock demonstrated a new way to turn initially transparent nanoparticles suddenly into strong absorbers for intense laser light and let them explode. ...more.


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