[Triumf-seminars] TRIUMF Special Seminar today at 12:30

[postmaster@admin.triumf.ca]

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Date/Time: Fri 2005-09-02 at 12:30

Location:  Auditorium          

Speaker:   Conny Hoehr (Argonne National Lab)

Title:     Electron impact ionization experiments using a reaction microscope

Abstract: Although helium is a relatively simple system, the many-body problem resulting from
its ionization remains unsolved to this day. To investigate this problem, the
ionization of helium by fast electron impact was investigated in kinematically
complete experiments. For these experiments, a so-called reaction microscope was
used, allowing data to be recorded over the full experimental solid angle for
energies in the few eV range. In this talk, the basic principles of a reaction
microscope will be explained and two experiments will be presented. First, a set of
differential cross sections of the double ionization of helium with an electron
projectile velocity of 6 a.u. will be compared to calculations and data at a higher
velocity and the dynamic mechanism leading to the ionization will be identified.
Second, cross sections of the first experiment due to single ionization in the
presence of an intense laser field will be presented and discussed in comparison
with theory.

Please bring your own lunch.

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