63 search results for “vibration” in the Public website
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Vibration Isolation
To be able to measure small forces or small deviations from Boltzmann, the external vibrations at the resonance frequency must be very low. To achieve this, we have developed a very soft vibration isolation system and combine it with several other measures to reduce vibrations in our dilution refrigerators.…
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New facility for production of liquid helium and new low-vibration lab
After 2 years of planning, designing, testing and adjusting, the brand-new low-vibration physics lab at the new Gorlaeus Building of the Science Campus is working like a charm and ready to make its mark in the world of science. Also, the renewed facility for the production of liquid helium is all do…
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Nuclear magnetic resonance force microscopy at millikelvin temperatures
Promotor: T.H. Oosterkamp
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Advances in SQUID-detected Magnetic Resonance Force Microscopy
In this thesis, we describe the latest advances in SQUID-detected Magnetic Resonance Force Microscopy (MRFM).
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Surface Reactivity of Activated CO2 Selective use of energy in splitting CO2
Juurlink
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Granular Flows: Fluidization and Anisotropy
Promotor: Prof.dr. M.L. van Hecke
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A semisynthetic peptide-metalloporphyrin responsive matrix for artificial photosynthesis
This thesis is concerned with the constitution of chiral responsive matrix assemblies that may undergo light-driven conformational changes and self-select vibrations to develop vibronic states for driving semi-classical coherent transfer with nearly 100% yield in a lossless NCAP process.
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Tjerk Oosterkamp Lab
We explore the possibilities to combine magnetic resonance techniques with atomic force microscopy together in a single microscope: the MRI-AFM, also called Magnetic Resonance Force Microscopy (MRFM).
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Quantum dynamics of dissociative chemisorption of CH4 on metal surfaces
The dissociation of CH4 into CH3 + H on a metal surface is the rate determining step in processes which produce hydrogen, such as steam reforming and catalytic partial oxidation. Ultimately, we want to study the dissociation of methane on Ni(111) and Pt(111) quantum mechanically while taking into account…
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Research
Research at the THEOR group is comprised of the following research themes:
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Frontiers in surface scattering simulations
Theorists have recently made substantial progress in simulating reactive molecule-metal surface scattering but still face major challenges. The grand challenge is to develop an approach that enables accurate predictive calculations of reactions involving electronically excited states with potential…
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Hydrogen dissociation on metal surfaces
Promotor: G. J. Kroes
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FRESH Lecture: Probing the surface of ice with nonlinear vibrational spectroscopy
Lecture
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Celebration renewed liquid Helium production facility & ultralow-vibration measuring facilities new Science building
Inaugural Lecture
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Taking control of charge transfer: strategic design for solar cells
Promotor: Huub J.M. de Groot, Co-promotor: Francesco Buda
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Infrared spectroscopy of astrophysically relevant hydrocarbons
This thesis is about the study of hydrocarbons via infrared spectroscopy.
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Making fuels from sunlight and CO2
Plants could be regarded as small chemical factories, which produce chemical substances via photosynthesis. If we can imitate photosynthesis in an artificial system, we can make clean fuels and materials out of sunlight and CO2. Huub de Groot is very close to designing a system of this kind.
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Modeling energy conversion dynamics at interfaces
Chemical reactions go hand-in-hand with an energy exchange with the environment in which they take place. Surfaces offer a variety of energy dissipation channels, constituted by the nuclear and electronic degrees of freedom of the atoms at the interface. Aiming at an improved future harvesting of energy,…
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Modeling energy conversion dynamics at interfaces
Chemical reactions go hand-in-hand with an energy exchange with the environment in which they take place. Surfaces offer a variety of energy dissipation channels, constituted by the nuclear and electronic degrees of freedom of the atoms at the interface. Aiming at an improved future harvesting of energy,…
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FRESH Lecture: Observation of long-lived molecular vibrations during adsorption and desorption on a metal surface
Lecture
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Développement phonético-phonologique en fulfulde et bambara d’enfants monolingues et bilingues : étude du babillage et des premiers mots
Cette étude montre que le développement phonético-phonologique en fulfulde et bambara est à la foiscomparable au développement langagier dans d’autres langues du monde et influencé par les caractéristiques phonétiques et phonologiques de ces deux langues notamment au niveau de la phonotaxe.
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Ab initio molecular dynamics calculations on reactions of molecules with metal surfaces
Promotor: Prof.dr. G.J. Kroes
- Jan van Ruitenbeek Lab
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Quantum Matter and Optics
The quantum nature of matter and light has grown into a broad and fruitful research field for theorists and experimentalists alike. It combines foundational research with toward applications, the most well known of which is the quantum computer.
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Chemical bond versus electromagnetic waves
Vibrating carbon monoxide molecules adsorbed at the surface of a salt crystal stop moving after a few milliseconds. Scientists now discovered this is dominantly due to the emission of electromagnetic waves. The role of the chemical bond at the surface thereby appears to be less important than previously…
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Chara
The Green algae Chara as model system for intra and inter cellular transport processes.
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From Big Bang to algorithm
Smart algorithms and powerful processors are just as essential for astronomy as big telescopes. Astronomers at Leiden University therefore constantly operate at the interface between astronomy and data science.
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The robust qubit: the Zen particle
A couple of years ago, theoretical physicist Carlo Beenakker tracked down the Majorana particles and inspired Leo Kouwenhoven from TU Delft to try to create them in a superconducting nano-structure. He succeeded in doing so in 2012, and the news made headlines around the world. But a lot of work still…
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Solvent effects in the electrocatalytic reactions of water
Koper
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The most stable microscope in the world
Making the most vibration-free, cryogenic scanning tunneling microscope in the world. A bold mission, but one that PhD candidate Irene Battisti successfully executed together with the Fine Mechanical Department. The new microscope might shed light on how unconventional superconductivity works. PhD Defence…
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1.3 million euros to catch quantum collapse
Leiden physicists Tjerk Oosterkamp and Dirk Bouwmeester have received a 1.3 million euro Science-Groot grant from NWO to catch a mystery at the core of quantum mechanics, together with Amsterdam physicist Jasper van Wezel.
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Sexual responses can be learned and unlearned
Undesirable associations with sex can be unlearned, but return if the circumstances change. They must therefore be unlearned in different situations. The drug D-cycloserine may help here. These are the findings of psychologist Mirte Brom.
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Solid State NMR and modelling of photoinduced energy and electron transfer
Huub de Groot is professor in Biophysical Organic Chemistry. With his team he works in the field of photosynthesis and artificial photosynthesis. The molecular basis for photosynthesis is formed by protein complexes and organelles that contain chlorophyll molecules. The antenna systems herein capture…
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Physics Nobel Prize for former Leiden Lorentz Professor
The 2017 Nobel Prize in Physics has been awarded to Rainer Weiss, Barry Barish and Kip Thorne for their work on the measurement of gravitational waves. Thorne was Lorentz Professor in 2009 in Leiden. Physicist Jan Willem van Holten explains why this is such an important discovery. ‘A new branch of astrophysics…
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HTSM grant for physicist Tjerk Oosterkamp
This header image was once elected Image of the Week by De Volkskrant and won second place in the LION Image Award. The research behind it is no less successful if we’re counting prizes. Last August, group leader Tjerk Oosterkamp was awarded an NWO Projectruimte grant, and now NWO-TTW grants him an…
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Technique from new cars helps with surgery selection Parkinson's disease
When parking in reverse, your car skids off just a little, hitting the wall of the parking garage. On the car dashboard, a warning light immediately starts blinking. This technique from new cars can also be used for another purpose, namely in the treatment of Parkinson's disease patients.
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Dick Stufkens Prize 2020 awarded to physical chemist Mark Koenis
The Dick Stufkens Prize 2020 for the best PhD thesis of the Holland Research School of Molecular Chemistry has been awarded to Dr Mark Koenis. Koenis graduated 21 February with the distinction cum laude on his thesis 'Advanced Spectra Analysis to Determine Complex Structure and Chirality'. He describes…
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FRESH Lecture: The Quantum Design of Photosynthesis
Lecture
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18 Veni subsidies for Leiden, 8 for our faculty!
This year, NWO has awarded a Veni subsidy to 143 young researchers who have recently obtained their PhD. 17 of these researchers are at Leiden University and one works at the LUMC. The successful applicants will each receive 250,000 euro to develop their ideas and carry out research over a period of…
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Exhibition on Celebrating Curiosity: Four centuries of university history
Fascinating images, articles of clothing and other unique objects from the past four centuries of the history of Leiden University can now be seen in the ‘Celebrating Curiosity’ exhibition in the hall of Rapenburg 70.
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One-way traffic for motion in new material
Scientists have developed a material that breaks one of the fundamental principles governing many physical systems. Ordinary materials transmit external forces equally, no matter where the pressure comes from. The newly developed material breaks this rule and could potentially be of interest in soft-robotics…
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Einstein’s light dances and spins in Leiden
The documentary Einstein’s Light by director Nickolas Barris shows in a dazzling manner what scientific breakthroughs resulted from the special friendship between Albert Einstein and the Leiden physicist Hendrik Antoon Lorentz. The documentary premiered at the Leiden International Film Festival on 2…
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Happy anniversary, liquid helium
111 years ago, Heike Kamerlingh Onnis liquified helium for the first time, a tour the force that netted him the Nobel prize. It took a laboratory of a size rarely seen. Now, ultracold helium has become a commodity for physics research. In Wolfgang Löffler's lab, it is ready at hand thanks to a coffee…
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Reedijk Symposium 2019: Modelling energy dissipation for molecules at surfaces
Lecture
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Joan van der Waals colloquium
Lecture
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John Mydosh and the mystery of the Hidden Order
A 35-year-old uranium crystal will not disclose its secret: what causes a dramatic phase transition at 17.5 Kelvin? Thanks to a new artificial intelligence approach, half of the possible explanations are excluded, but the definitive answer remains to be found. 'It is very frustrating', says physicist…
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ERC Advanced Grant for Carlo Beenakker to ‘braid’ Majorana fermions
Theoretical physicist Carlo Beenakker has been awarded a €2m Advanced Grant by the European Research Council (ERC). He will use this to try to create the ideal building blocks for a quantum computer: ‘braided’ Majorana fermions. An ambitious project that may just lead to a major breakthrough.
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Leiden physicists image lumpy superconductor
High-temperature superconductivity is one of the big mysteries in physics. Milan Allan’s research group used a Josephson Scanning Tunneling Microscope to image spatial variations of superconducting particles for the first time, and published about it in the journal Nature.
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New ONEM Microscope to combine best of two worlds
Leiden physicists have been awarded 1.5 million euros for developing a hybrid microscope that provided nanometer-resolution. 'The idea is to combine the resolution of electron microscopy with the pros of optical microscopes.'
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‘My mother couldn’t attend my wedding due to corona measures’
At the Faculty of Science, forty per cent of the employees are of a non-Dutch nationality. Amongst PhDs that is even sixty per cent. How are they doing in a time of working at home in a different culture, when travelling is not possible? Biologist Astri Kusumawardhani is the second in this series to…