We warmly invite you to participate in a new series of scientific seminars organised by the User Office at MAX IV, Lund University
Where – Virtual format by Zoom call https://lu-se.zoom.us/j/61349123545
When – Mondays 13:45 CET
Format – 30 minutes of presentation followed by 15 minutes of discussion, chaired by MAX IV staff
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Monday 19 April 2021, 13:45 CET
Water uptake at low relative humidity onto atmospherically relevant nanoparticles studied with APXPS
Speaker: Dr Jack Lin, Nano and Molecular Systems Research Unit, University of Oulu, Finland
Host: Dr Esko Kokkonen, manager at SPECIES beamline
Keywords: serial ambient pressure X-ray photoelectron spectroscopy (APXPS); atmospheric aerosols; atmospheric chemistry; water
The interaction between particulate matter and water is important to several atmospheric processes, including atmospheric chemistry and cloud formation, that have an impact on climate, air quality, and the water cycle. Traditional atmospheric measurement techniques that rely on detecting changes in mass or volume are not sensitive to the adsorption of water at low relative humidity (RH). We used APXPS to study laboratory generated nanoparticles of atmospheric interest at 0-16% RH. Our results suggest the possibility of water adsorption to the particle surface even at RH well below deliquescence which has implications for atmospheric chemistry.
Monday 26 April 2021, 13:45 CET
Scanning transmission X-ray microscopy for organic photovoltaics
Speaker: Dr Erik Mårsell, Postdoc at SoftiMAX beamline, MAX IV, Lund University, Sweden
Host: Dr Karina Thånell, manager at SoftiMAX beamline
Keywords: organic photovoltaics, solar cells , scanning transmission X-ray microscopy
Organic photovoltaics shows great promise for lightweight, low-cost, flexible solar cells with low embodied energy. However, the power conversion efficiency is currently too low for widespread commercial success. Furthermore, questions remain regarding the long-term stability of devices under typical operation conditions. To address these questions, we need to further investigate the electronic and morphologic structure of the donor-acceptor molecular blends responsible for light absorption and electron-hole separation. I will describe SoftiMAX and its scanning transmission X-ray microscopy (STXM) end station, and how it can be used to study organic photovoltaic devices. STXM has the capability to simultaneously measure the morphology, composition, and crystallinity of the active layer, potentially under operational conditions. These parameters can then be correlated with growth conditions and device efficiencies to better understand how to improve organic solar cells.
Monday 3 May 2021, 13:45 CET
Solution structure and self-association of pharmaceutical proteins
Speaker: Prof Pernille Harris, Department of Chemistry, University of Copenhagen, Denmark
Host: Dr Ann Terry, Diffraction and Scattering Group Manager, CoSAXS beamline
Keywords: small-angle X-ray scattering, protein-protein interactions, protein formulation, protein aggregation
The use of small angle X-ray scattering as a powerful method for investigating protein structure and complex formation in ideal solutions has been established and refined the last decades. SAXS is used more or less routinely as a supplement to other structural investigations or even as a standalone technique for structural information. However, SAXS is much more than that. It is also a biophysical technique that can be used for high-throughput characterization and for investigations of protein-protein interactions in high-concentration samples.
We are successfully using SAXS in different ways to characterize proteins in pharmaceutically relevant solutions, combining it with other high-throughput techniques and in-silico modeling.
Monday 10 May 2021, 13:45 CET
Time-resolved luminescence spectroscopy in studies of ultrafast processes in scintillators
Speaker: Prof Marco Kirm, Department of Natural and Exact Sciences, Institute of Physics, University of Tartu, Estonia
Host: Dr Antti Kivimäki, manager at FinEstBeAMS beamline
Keywords: Ultrafast scintillators, Time-resolved luminescence spectroscopy, novel hexafluorogermanate scintillators
Ultrafast scintillators with a superior temporal resolution are needed in different applications: in high-energy physics to prevent pile-up effects at high event rates as well as in time-of-flight positron emission tomography to improve the resolution in diagnostic images in medicine. In order to develop such materials extensive knowledge is needed on their electronic band structure verified with experimental spectroscopic data in a wide energy range. Time-resolved luminescence spectroscopy is an indispensable tool in studies of wide gap scintillators, in particular, the peculiarities of relaxation processes of electronic excitations and their time evolution. In order to study ultrafast processes, experimental facilities with sub-nanosecond time resolution are needed. Such setups have been successfully implemented at FinEstBeAMS and FemtoMAX, where the instrumental response function as short as 160 ps (in single bunch mode) and 28 ps, respectively, were achieved. Based on the results obtained at these setups by time-resolved luminescence methods, I will discuss the relaxation processes of electronic excitations in novel hexafluorogermanate scintillators leading to the ultrafast cross- and intraband luminescence with sub-nanosecond lifetime.
Monday 17 May 2021, 13:45 CET
Speaker: Prof Jonas Weissenrieder, Materials and Nano Physics, AlbaNova, KTH, Sweden
Host: Dr Andrey Shavorskiy, manager at HIPPIE beamline
Monday 24 May 2021, 13:45 CET
Speaker: Prof Ingmar Persson, Department of Molecular Sciences, Swedish University of Agricultural Science (SLU), Sweden
Host: Dr Kajsa Sigfridsson Clauss, scientist at Balder beamline
Monday 31 May 2021, 13:45 CET
Speaker: Dr Suzanne Zoë Fisher, Group Leader Deuteration and Macromolecular Crystallization (DEMAX) Platform, European Spallation Source ERIC, Sweden
Host: Dr Ana González, manager at BioMAX beamline
Monday 7 June 2021, 13:45 CET
Speaker: Assoc Prof Minna Patanen, Nano and Molecular Systems Research Unit, University of Oulu, Finland
Host: Dr Noelle Walsh, scientist at FlexPES beamline
Monday 14 June 2021, 13:45 CET
Speaker: Dr Robert Corkery, Applied Physical Chemistry, KTH Royal Institute of Technology, Sweden
Host: CoSAXS beamline
Monday 21 June 2021, 13:45 CET
Speaker: Dr Pablo Villanueva Pérez, Associate Senior Lecturer, Synchrotron Radiation Research, Lund University, Sweden
Host: Dr Maik Kahnt, Postdoc at NanoMAX beamline
The initiative aims to share knowledge and stimulate enthusiastic discussions on synchrotron research and methods developed at MAX IV. These shall be a channel to learn more about our facility, strengthen collaborations, bring communities together and promote cooperation and interdisciplinarity.
The speakers will be MAX IV past, current and potential future users, as well as MAX IV staff; on the other hand, welcome attendees are members of the broad scientific community: scientists from the speaker´s home institution, of Swedish and international universities as well as MAX IV and other light sources staff.
We look forward to seeing you online and hope you enjoy the talks!
name Doriana Orbanic