I lead a group studying phenomena and processes in liquids, nanoparticles and clusters using synchrotron radiation-based spectroscopic techniques. We choose systems and problems that are relevant for two main directions: Environmental molecular science and Nanoscience.
Environmental molecular science aims to increase our fundamental, molecular-level understanding of natural and anthropogenic processes in the biosphere, which may be used to guide efforts to prevent and reduce human-induced environmental problems. In collaboration with atmosphere, water and soil scientists, we study for example the surface structure of water solutions of ions and molecules, as function of concentration and pH.
Nanoscience is concerned with understanding and controlling matter on an atomic and molecular scale. We study metal and semiconductor clusters, which consist of a small number of atoms, and thus bridge the gap between atoms and solids. We explore the how the electronic structure changes with size, especially for small clusters in the quantum size regime. We also probe the raial structure of nano-alloys, i.e. mixed metal clusters.
150+ articles in international, peer-reviewed, journals, 2700+ citations (SCI), h index 30 (Web of Science)
This is a selection of publications which I consider to be my best, not neccesarily the most cited:
Core level photoelectron and x-ray absorption spectroscopy of free argon clusters: Size dependent energy shifts and determination of surface atom coordination, O. Björneholm, F. Federmann, F. Fössing and T. Möller, Phys. Rev. Lett. 74, 3017 (1995)
Femtosecond dissociation of core-excited HCl monitored by frequency detuning, O. Björneholm, S. Sundin, S. Svensson, R. R. T. Marinho, A. Naves de Brito, F. Gel’mukhanov and H. Ågren, Phys. Rev. Lett. 79, 3150 (1997)
Doppler splitting at in-flight Auger decay of dissociating oxygen molecules: The localization of delocalized core holes, O. Björneholm, M. Bässler, A. Ausmees, I. Hjelte, R. Feifel, H. Wang, C. Miron, M.N. Piancastelli, S. Svensson, S. L. Sorensen, F. Gel'mukhanov and H. Ågren, Phys. Rev. Lett. 84, 2826 (2000)
Variable surface composition and radial interface formation in self-assembled free, mixed Ar/Xe clusters, M. Tchaplyguine, M. Lundwall, M. Gisselbrecht, G. Öhrwall, R. Feifel, S. Sorensen, S. Svensson, N. Mårtensson and O. Björneholm, Phys. Rev. A 69, 31201 (2004)
Femtosecond interatomic Coulombic decay in free neon clusters: Large lifetime differences between surface and bulk, G. Öhrwall, M. Tchaplyguine, M. Lundwall, R. Feifel, H. Bergersen, T. Rander, A. Lindblad, J. Schulz, S. Peredkov, S. Barth, S. Marburger, U. Hergenhahn, S. Svensson and O. Björneholm, Phys. Rev. Lett. 93, 173401 (2004)
The electronic structure of free water clusters probed by Auger electron spectroscopy, G. Öhrwall, R.F. Fink, M. Tchaplyguine, L. Ojamäe, M. Lundwall, R.R.T. Marinho, A. Naves de Brito, S.L. Sorensen, M. Gisselbrecht, R. Feifel, T. Rander, A. Lindblad, J. Schultz, L.J. Saethre, N. Mårtensson, S. Svensson, and O. Björneholm, J. Chem. Phys. 123, 054310 (2005)
Free nanoscale sodium clusters studied by core-level photoelectron spectroscopy, S. Peredkov, O. Björneholm, G. Öhrwall, J. Schulz, M. Lundwall, T. Rander, A. Lindblad, H. Bergersen, S. L. Sorensen, S. Svensson, A. Rosso, W. Pokapanich, N. Mårtensson and M. Tchaplyguine, Phys. Rev. B75, 235407 (2007)
Large variations in the propensity of aqueous oxychlorine anions for the solution/vapor interface, N. Ottosson, R. Vácha, E. F. Aziz, W. Pokapanich, W. Eberhardt, S. Svensson, G. Öhrwall, P. Jungwirth, O. Björneholm and B. Winter, J. Chem. Phys 131, 124706 (2009)
Single-component surface in binary self-assembled NaK nanoalloy clusters, M. Tchaplyguine, S. Legendre, A. Rosso, I. Bradeanu, G. Öhrwall, S. Canton, T. Andersson, N. Mårtensson, S. Svensson and O. Björneholm, Phys. Rev. B 80, 033405 (2009)
The influence of concentration on the molecular surface structure of simple and mixed aqueous electrolytes, Niklas Ottosson, Jan Heyda, Erik Wernersson, Wandared Pokapanich, Svante Svensson, Bernd Winter, Gunnar Öhrwall, Pavel Jungwirth and Olle Björneholm, Physical Chemistry Chemical Physics 12, 10693 (2010)
Ångström's Award 1995, Bergstedtska priset 2002 (Kungliga Vetenskapssociteten)
My research is funded by Vetenskapsrådet (the Swedish research Council). Funding from the Knut and Alice Wallenberg Foundation has been crucial for the build-up of new exprerimental equipment.
Ingela Hjelte 2002, Raimund Feifel 2003, Florian Burmeister 2003, Karoline Wiesner 2004, Marcus Lundwall 2007, Torbjörn Rander 2007, Andreas Lindblad 2008, Henrik Bergersen 2008
Post-docs with whom I have collaborated within the group
Maxim Tchaplyguine (1999-2001) Catalin Miron (1998-2000), Mathieu Giselbrecht (2000-2002), Joachim Schulz (2002-2004), Ricardo Marinho (2005-2007), Ioana Bradeanu (2007-2008), Sebastien Legendre (2007-2008)
Present position: Since 2001 lecturer, promoted to professor 2006
Previous positions: 1995-2001 NFR Junior researcher
Docent degree: Docent in physics of molecules and clusters, UU1997
Post-doctor: 1993-1995 with Dr. Thomas Möller at Hasylab, DESY, Hamburg
PhD exam: 1992 in surface physics, with thesis “Adsorbate core-hole excitation and decay dynamics”, supervisor Nils Mårtensson
BSc exam 1986 in physics
Past-time activities and interests
Family (wife and three children) and friends
Team manager for the Alsike-Lagga-Långhundra P00 (Boys -00) football team:
Last updated 2010-11-11 14:37.
Editor: Olle Björneholm