Atomic and molecular physics
The atomic and molecular physics research in NANOMO targets the inner and core shell photoexcitation and related processes. The experimental techniques range from conventional electron spectroscopy carried out using hemispherical analyzers to photoelectron-photoion spectroscopy and many-electron coincidence measurements using magnetic-bottle time-of-flight devices. The measurements are performed at synchrotron radiation sources around Europe, for example at MAX-IV laboratory in Lund and SOLEIL synchrotron in Paris.
The research is strongly focused in theoretical understanding of the studied processes. For small systems we carry out atomic and molecular simulations starting from the first principles utilizing the latest quantum mechanical frameworks and programs. For understanding larger systems we use multiscale methods and semi-classical molecular dynamics modeling. The work varies from the use of established programs to the development of new theories and codes.
Currently the research topics focus to the use and study of many-electron phenomena present in core shell photon-matter interaction in soft to tender X-ray energy regions. These include topics, such as, Auger emission cascades, photoionization satellite transitions, direct multiple photoionization and simultaneous many-electron Auger decay. The research is important in understanding the behavior and correlations in many-particle quantum mechanical systems including continuum processes. The methods allow also the study of ions at various charge states. In the field of molecular physics we have been concentrating especially to the study of fragmentation of molecules subsequent to core-shell ionization using photoion-photoelectron spectroscopy.
Docent Saana-Maija Huttula