2010/09/23 by Johannes Eiglsperger, Javier Madroñero
Physics and Astronomy · #Quantum, superfluid, helium dynamics #Advanced Chemical Physics Studies #Quantum chaos and dynamical systems
paper · doi:10.1103/physreva.82.033422
The fluctuating part of the total photoionization cross sections up to the 20th single ionization threshold from the ground state of helium are investigated within a planar model of the atom. The calculated fluctuations reproduce existing experimental observations rather well. The fluctuations are mainly due to a dominant series of resonances which can be associated with an approximate quantum number F=N\ensuremath-K. As the energy approaches the double ionization threshold, the dominant role of a single series as sole contributor is apparently lost as new series start to contribute significantly to the cross sections.