Observation of site-selective chemical bond changes via ultrafast chemical shifts

Autor: Andre Al-Haddad, Solène Oberli, Jesús González-Vázquez, Maximilian Bucher, Gilles Doumy, Phay Ho, Jacek Krzywinski, Thomas J. Lane, Alberto Lutman, Agostino Marinelli, Timothy J. Maxwell, Stefan Moeller, Stephen T. Pratt, Dipanwita Ray, Ron Shepard, Stephen H. Southworth, Álvaro Vázquez-Mayagoitia, Peter Walter, Linda Young, Antonio Picón, Christoph Bostedt

Publikováno v: Nature Communications, Vol 13, Iss 1, Pp 1-7 (2022)

X-ray photoelectron spectroscopy probes the chemical environment in a molecule at a specific atomic site. Here the authors extend this concept with a site selective trigger to follow chemical bond changes as they occur on the femtosecond time scale.

Externí odkaz: https://doaj.org/article/790ca6a546db4a61a506d320dcb718c9

Demonstration of full polarization control of soft X-ray pulses with Apple X undulators at SwissFEL using recoil ion momentum spectroscopy

Autor: Christoph Kittel, Antoine Sarracini, Sven Augustin, Ningchen Yang, Andre Al Haddad, Eugenio Ferrari, Gregor Knopp, Jonas Knurr, Ana Sofia Morillo-Candas, Iwona Swiderska, Eduard Prat, Nicholas Sammut, Thomas Schmidt, Christoph Bostedt, Marco Calvi, Kirsten Schnorr

Publikováno v: Journal of Synchrotron Radiation, Vol 31, Iss 5, Pp 1134-1145 (2024)

The ability to freely control the polarization of X-rays enables measurement techniques relying on circular or linear dichroism, which have become indispensable tools for characterizing the properties of chiral molecules or magnetic structures. There

Externí odkaz: https://doaj.org/article/81799525899346809fc7ddf293578e48

A compact gas attenuator for the SwissFEL ATHOS beamline realized using additive manufacturing

Autor: Claude Pradervand, Colette Rosenberg, Hans-Jörg Eckerlin, Kirsten Schnorr, Andre Al Haddad, Peter Wiegand, Christoph Hess, Nazareno Gaiffi, Luc Patthey

Publikováno v: Journal of Synchrotron Radiation, Vol 30, Iss 4, Pp 717-722 (2023)

Gas attenuators are important devices providing accurate variation of photon intensity for soft X-ray beamlines. In the SwissFEL ATHOS beamline front-end the space is very limited and an innovative approach has been taken to provide attenuation of th

Externí odkaz: https://doaj.org/article/868913a657354fcba1030dfae0902080

Aggregation of solutes in bosonic versus fermionic quantum fluids

Autor: Alexandra J. Feinberg, Deepak Verma, Sean M.O. O’Connell-Lopez, Swetha Erukala, Rico Mayro P. Tanyag, Weiwu Pang, Catherine A. Saladrigas, Benjamin W. Toulson, Mario Borgwardt, Niranjan Shivaram, Ming-Fu Lin, Andre Al Haddad, Wolfgang Jäger, Christoph Bostedt, Peter Walter, Oliver Gessner, Andrey F. Vilesov

Publikováno v: Feinberg, A J, Verma, D, O’Connell-Lopez, S M O, Erukala, S, Tanyag, R M P, Pang, W, Saladrigas, C A, Toulson, B W, Borgwardt, M, Shivaram, N, Lin, M F, Haddad, A A, Jäger, W, Bostedt, C, Walter, P, Gessner, O & Vilesov, A F 2021, ' Aggregation of solutes in bosonic versus fermionic quantum fluids ', Science Advances, vol. 7, no. 50, eabk2247 . https://doi.org/10.1126/sciadv.abk2247
Science Advances
Science advances, vol 7, iss 50

Description
Clusters in 3He and 4He nanodroplets reveal markedly different shapes showcasing the effect of superfluidity on aggregation.
Quantum fluid droplets made of helium-3 (3He) or helium-4 (4He) isotopes have long been considered as i

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cd08810190cd261e50da8101ed729aed
https://pure.au.dk/portal/da/publications/aggregation-of-solutes-in-bosonic-versus-fermionic-quantum-fluids(4692f957-2af1-4ef4-99c5-5a84a143ac1c).html

Correlation-Driven Transient Hole Dynamics Resolved in Space and Time in the Isopropanol Molecule

Autor: Siqi Li, Ludvig Kjellsson, A. Clark, Leszek J. Frasinski, Morgane Vacher, Agostino Marinelli, Alberto Lutman, Richard J. Squibb, Douglas Garratt, Sebastian Jarosch, Raimund Feifel, Michael J. Bearpark, Esben Witting Larsen, James P. Cryan, Ryan Coffee, J. P. Marangos, Oliver Alexander, Michael A. Robb, M. Ruberti, Marcus Agåker, Kiyoshi Ueda, Taran Driver, John D. Bozek, Christopher Arrell, Alvaro Sanchez-Gonzalez, Christoph Bostedt, T. J. Maxwell, Yoshiaki Kumagai, Vitali Zhaunerchyk, Timur Osipov, A. Tan, Philip H. Bucksbaum, D. J. Walke, B. D. Cooper, Andre Al Haddad, Thomas J. A. Wolf, Paloma Matia-Hernando, Jan-Erik Rubensson, Christian Brahms, Darien Wood, T. Barillot, Přemysl Kolorenč, Nora Berrah, Allan S. Johnson, Peter Walter, Conny Såthe, Vitali Averbukh, Gilles Doumy, John W. G. Tisch

Publikováno v: Physical Review X, Vol 11, Iss 3, p 031048 (2021)
Physical Review X
Physical Review X, American Physical Society, 2021, 11 (3), ⟨10.1103/PhysRevX.11.031048⟩

The possibility of suddenly ionized molecules undergoing extremely fast electron hole (or hole) dynamics prior to significant structural change was first recognized more than 20 years ago and termed charge migration. The accurate probing of ultrafast

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::32158b644a28472af38c930feb5361ff
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-455870