Resonant mjukröntgenspridning för studier av atomer och molekyler

Tidsperiod: 2012-01-01 till 2014-12-31

Projektledare: Jan-Erik Rubensson

Finansiär: Vetenskapsrådet

Bidragstyp: Projektbidrag

Budget: 2 400 000 SEK

Resonant Inelastic Soft X-ray Scattering (RIXS) and related experiments are applied to atoms and molecules. The most important assets of the RIXS process include Ångström-scale site-specificity, access to the femtosecond time scale, and the symmetry selectivity imposed by dipole selectivity. For atoms the efforts are concentrated on helium as the prototypical two-electron system, especially its double excitations. Related to these studies are the efforts to exploit the corresponding processes, involving hollow states in light metal ions in aqueous solution and in solid compounds.High-resolution RIXS will be applied to free molecules, liquids, and molecular materials. With vibrational resolution a wealth of detailed information about the coupling between the electronic and nuclear degrees of freedom, and about the dynamics on the duration time of the process emerges. Especially, the unique sensitivity of this method to the potential surface of the electronic ground state, locally at selected atomic sites will have many applicationsMeasurements are performed using the current state-of-the-art facilities, and instrumentation is developed in parallel. In the near future the new plane-grating spectrometer will be working at MAX-II, and the I511 beamline will be adapted to match this spectrometer. In the longer perspective a world-leading RIXS facility at MAX IV is planned.