89 research outputs found
Coherent multidimensional spectroscopy in the gas phase
Recent work applying multidimentional coherent electronic spectroscopy at
dilute samples in the gas phase is reviewed. The development of refined
phase-cycling approaches with improved sensitivity has opened-up new
opportunities to probe even dilute gas-phase samples. In this context, first
results of 2-dimensional spectroscopy performed at doped helium droplets reveal
the femtosecond dynamics upon electronic excitation of cold, weakly-bound
molecules, and even the induced dynamics from the interaction with the helium
environment. Such experiments, offering well-defined conditions at low
temperatures, are potentially enabling the isolation of fundamental processes
in the excitation and charge transfer dynamics of molecular structures which so
far have been masked in complex bulk environments.Comment: Invited Review Articl
The CODATA-RDA Data Steward School
Given the expected increase in demand for Data Stewards and Data Stewardship skills it is clear that there is a need to develop training, education and CPD (continuous professional development) in this area.
In this paper a brief introduction is provided to the origin of definitions of Data Stewardship. Also it notes the present tendency towards equivalence between Data Stewardship skills and FAIR principles. It then focuses on one specific training event – the pilot Data Stewardship strand of the CODATA-RDA Research Data Science schools that by the time of the IDCC meeting will have been held in Trieste in August 2019. The paper will discuss the overall curriculum for the pilot school, how it matches with the FAIR4S framework, and plans for getting feedback from the students.
Finally, the paper discuss future plans for the school, in particular how to deepen the integration between the Data Stewardship strand with the Early Career Researcher strand.
[This paper is a conference pre-print presented at IDCC 2020 after lightweight peer review.
Recommendations for services in a FAIR data ecosystem
This report highlights common challenges and priorities, and proposes a set of initial recommendations on how existing data infrastructures can evolve and collaborate to provide services that support the implementation of the FAIR data principles, in particular in the context of building the European Open Science Cloud (EOSC). The report is an output of three workshops designed to explore, discuss and formulate such recommendations and is aimed at stakeholders in the scholarly world and particularly the EOSC Governance
Recommendations for services in a FAIR data ecosystem
The development and growing adoption of the FAIR data principles and associated standards as a part of research policies and practices place novel demands on research data services. This article highlights common challenges and priorities and proposes a set of recommendations on how data infrastructures can evolve and collaborate to provide services that support the implementation of the FAIR data principles, in particular in the context of building the European Open Science Cloud (EOSC). The recommendations cover a broad area of topics, including certification, infrastructure components, stewardship, costs, rewards, collaboration, training, support, and data management. These recommendations were prioritized according to their perceived urgency by different stakeholder groups and associated with actions as well as suggested action owners. This article is the output of three workshops organized by the projects FAIRsFAIR, RDA Europe, OpenAIRE, EOSC-hub, and FREYA designed to explore, discuss, and formulate recommendations among stakeholders in the scientific community. While the results are a work-in-progress, the challenges and priorities outlined provide a detailed and unique overview of current issues seen as crucial by the community that can sharpen and improve the roadmap toward a FAIR data ecosystem
Coherent multidimensional spectroscopy of dilute gas-phase nanosystems
Two-dimensional electronic spectroscopy (2DES) is one of the most powerful
spectroscopic techniques, capable of attaining a nearly complete picture of a
quantum system including its couplings, quantum coherence properties and its
real-time dynamics. While successfully applied to a variety of condensed phase
samples, high precision experiments on isolated quantum systems in the gas
phase have been so far precluded by insufficient sensitivity. However, such
experiments are essential for a precise understanding of fundamental mechanisms
and to avoid misinterpretations, e.g. as for the nature of quantum coherences
in energy trans-port. Here, we solve this issue by extending 2DES to isolated
nanosystems in the gas phase prepared by helium nanodroplet isolation in a
molecular beam-type experiment. This approach uniquely provides high
flexibility in synthesizing tailored, quantum state-selected model systems of
single and many-body properties. For demonstration, we deduce a precise and
conclusive picture of the ultrafast coherent dynamics in isolated high-spin Rb2
molecules and present for the first time a dynamics study of the system-bath
interaction between a single molecule (here Rb3) and a superfluid helium
environment. The results demonstrate the unique capacity to elucidate
prototypical interactions and dynamics in tailored quantum systems and bridges
the gap to experiments in ultracold quantum science
Building Prototypes Aggregating Musicological Datasets on the Semantic Web
Semantic Web technologies such as RDF, OWL,
and SPARQL can be successfully used to bridge complementary
musicological information. In this paper, we describe,
compare, and evaluate the datasets and workflows
used to create two such aggregator projects: In Collaboration
with In Concert, and JazzCats, both of which bring
together a cluster of smaller projects containing concert
and performance metadata
Strain-induced phonon shifts in tungsten disulfide nanoplatelets and nanotubes
The relationship between structure and properties has been followed for different nanoscale forms of tungsten disulfide (2H-WS2) namely exfoliated monolayer and few-layer nanoplatelets, and nanotubes. The similarities and differences between these nanostructured materials have been examined using a combination of optical microscopy, scanning and high-resolution transmissionelectron microscopy (SEM and HRTEM) and atomic force microscopy (AFM). Photoluminescence (PL) and Raman spectroscopy have also been used to distinguish between monolayer and few-layer material. Strain induced phonon shifts have been followed from the changes in the positions of the A1g and E2g1 Raman bands during uniaxial deformation. This has been modelled for monolayer using density functional theory (DFT) with excellent agreement between the measured and predicted behaviour. It has been found that as the number of WS2 layers increases for few-layer crystals or nanotubes, the A1g mode hardens whereas the E2g1 mode softens. This is believed to be due to theA1g mode, which involves out of plane atomic movements, being constrained by the increasing number of WS2 layers whereas easy sliding reduces stress transfer to the individual layers for the E2g1mode, involving only in-plane vibrations. This finding has enabled the anomalous phonon shift behaviour in earlier pressure measurements on WS2 to be resolved, as well as similar effects in othertransition metal dichalcogenides, such as molybdenum disulfide (MoS2), to be explained. <br/
- …