Welcome to the ICD resarch unit page!
The topic of this research unit is the investigation of a novel, recently discovered mechanism for the transformation of electronic energy created by excitation or ionization with radiation in the UV and far beyond, or with energetic particles. In addition to photoemission from an excited atom and the emission of an Auger-electron, Intermolecular or Interatomic Coulombic Decay provides a third, additional decay mechanism, which is alternative to fluorescence for low excitation energies, and to emission of an Auger electron for more highly excited states. ICD is not a resonant process, and is therefore expected to occur under general conditions. Thus it is expected to find ICD in many systems and configurations.
Putting ICD in a broader context, it bridges the gap between fundamental research on the correlated motion of electrons and nuclei and more applied research, for example, on the influence of low kinetic energy electrons in radiation chemistry. In this research unit we expect to contribute not only exciting experiments on the ultrafast dynamics of the electronic cloud but also new ideas directed towards new fields of application.
This research unit is a collaboration of the leading scientists in ICD in Germany and Austria from Goethe-Universität Frankfurt, Universität Innsbruck, Universität Heidelberg, Universität Hamburg, Max-Planck-Institut für Plasmaphysik and Helmholtz Zentrum Berlin [More].
6.12.2013 - Frankfurt Group publishes new Paper in PRL
Vibrationally Resolved Decay Width of Interatomic Coulombic Decay in HeNe
F. Trinter, J. B. Williams, M. Weller, M. Waitz, M. Pitzer, J. Voigtsberger, C. Schober, G. Kastirke, C. Müller, C. Goihl, P. Burzynski, F. Wiegandt, R. Wallauer, A. Kalinin, L. Ph. H. Schmidt, M. S. Schöffler, Y.-C. Chiang, K. Gokhberg, T. Jahnke, and R. Dörner
Phys. Rev. Lett. 111, 233004 (2013)
We investigate the ionization of HeNe from below the He 1s3p excitation to the He ionization threshold. We observe HeNe+ ions with an enhancement by more than a factor of 60 when the He side couples resonantly to the radiation field. These ions are an experimental proof of a two-center resonant photoionization mechanism predicted by Najjari et al. [Phys. Rev. Lett. 105, 153002 (2010)]. Furthermore, our data provide electronic and vibrational state resolved decay widths of interatomic Coulombic decay in HeNe dimers. We find that the interatomic Coulombic decay lifetime strongly increases with increasing vibrational state.
14.11.2013 - Gustav-Hertz-Preis 2014 is awarded to PD Dr. Till Jahnke
The Gustav-Hertz-Preis 2013 of the German Physical Society is awarded to PD Dr. Till Jahnke, who is one of the project leaders in the DFG ICD Research Unit.
"Für seine bahnbrechenden experimentellen Untersuchungen zur langreichweitigen van-der-Waals-Wechselwirkung in Molekülen, insbesondere für seine Arbeiten zum interatomaren Coulomb-Zerfall.“
02.10.2013 - Evolution of Interatomic Coulombic Decay in the Time Domain – Jahnke Group publishes in PRL
Evolution of Interatomic Coulombic Decay in the Time Domain
F. Trinter, J. B. Williams, M. Weller, M. Waitz, M. Pitzer, J. Voigtsberger, C. Schober, G. Kastirke, C. Müller, C. Goihl, P. Burzynski, F. Wiegandt, T. Bauer, R. Wallauer, H. Sann, A. Kalinin, L. Ph. H. Schmidt, M. Schöffler, N. Sisourat and T. Jahnke
Phys. Rev. Lett. 111, 093401 (2013)
During the past 15 years a novel decay mechanism of excited atoms has been discovered and investigated. This so-called interatomic Coulombic decay (ICD) involves the chemical environment of the electronically excited atom: the excitation energy is transferred (in many cases over long distances) to a neighbor of the initially excited particle usually ionizing that neighbor. It turned out that ICD is a very common decay route in nature as it occurs across van der Waals and hydrogen bonds. The time evolution of ICD is predicted to be highly complex, as its efficiency strongly depends on the distance of the atoms involved and this distance typically changes during the decay. Here we present the first direct measurement of the temporal evolution of ICD using a novel experimental approach.