87 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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Maria Kazour
Science
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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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Granular Flows: Fluidization and Anisotropy
Promotor: Prof.dr. M.L. van Hecke
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Tjerk Oosterkamp Lab (Microscopy and Quantum Mechanics at milliKelvin temperatures)
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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Hydrogen dissociation on metal surfaces
Promotor: G. J. Kroes
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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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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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Infrared spectroscopy of astrophysically relevant hydrocarbons
This thesis is about the study of hydrocarbons via infrared spectroscopy.
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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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Highly Efficient Activation of HCl Dissociation on Au(111) via Rotational Preexcitation
The probability for dissociation of molecules on metal surfaces, which often controls the rate of industrially important catalytic processes, can depend strongly on how energy is partitioned in the incident molecule. There are many example systems where the addition of vibrational energy promotes reaction…
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Accurate Probabilities for Highly Activated Reaction of Polyatomic Molecules on Surfaces Using a High-Dimensional Neural Network Potential: CHD3
An accurate description of reactive scattering of molecules on metal surfaces often requires the modeling of energy transfer between the molecule and the surface phonons. Although ab initio molecular dynamics (AIMD) can describe this energy transfer, AIMD is at present untractable for reactions with…
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Dissociative chemisorption on transition metal surfaces
The dissociative chemisorption of a molecule on a transition metal surface represents a rate-limiting step in many heterogeneously catalyzed processes, whereby most chemicals are made. In spite of the importance of this reaction, an accurate first principles approach to modeling it does not yet exist.…
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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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FRESH Lecture: Observation of long-lived molecular vibrations during adsorption and desorption on a metal surface
Lecture
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The Infrared Spectrum of Massive Protostars
We have conducted a full spectral line survey of the 3-13 micron region of two massive protostars, AFGL 2591 and AFGL 2136, for the first time at high spectral resolution.
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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 (Atomic and Molecular Conductors)
- Quantum Information
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Research
Research at the THEOR group is comprised of the following research themes:
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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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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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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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Lyndsey Housden
Lyndsey Housden teaches in the Interactive/Media/Design department at the Royal Academy of Art (KABK), The Hague. She is a researcher and artist, working with interactive and haptic installations, spatial design and interdisciplinary projects for exhibitions, theatre, and festivals.
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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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Marcel Cobussen receives Best Speaker Award
On November 9, Marcel Cobussen received the Best Speaker Award of the 2021 Conference on Sound, Sound Studies, and Soundscaping.
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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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Quantum dynamics of H2 on metal surfaces: researching the role of surface atoms
This research focuses on the (Quantum) Dynamics (QD) of the reactive scattering of H2 from metal surfaces.
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dis/cord : Thinking Sound through Agential Realism
ACPA alumnus Kevin Toksöz Fairbairn has just published a new book at Punctum Books - dis/cord: Thinking Sound through Agential Realism.
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Gaia sees strange stars in most detailed Milky Way survey to date
Today, ESA’s Gaia mission releases its new treasure trove of data about our home galaxy. Astronomers, led by the Leiden astronomer Anthony Brown, describe strange ‘starquakes’, stellar DNA, asymmetric motions and other fascinating insights in this most detailed Milky Way survey to date.
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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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Public Arduino video lectures
For our course "Hardware & Physical Computing" several short videos about Arduino programming were recorded. We decided to share these video lectures publicly. They introduce Arduino boards through simple examples that demonstrate how to connect and program the Arduino. So you can decide if you can…
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Space Station Art Gallery
An artwork by Guy Livingston has been chosen to launch into space and be exhibited on the International Space Station.
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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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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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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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Tenure track faculty position in experimental quantum matter and optics
Science, Leiden Institute of Physics (LION)
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Tenure track faculty position in experimental quantum matter and optics
Science, Leiden Institute of Physics (LION)