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Date: |
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Time: |
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Thursday, 21. Mar. 2013 |
High
resolutions video (any system with MP4-support): |
10:00 – 11:15 |
Abstract:
DESIREE
(Double ElectroStatic Ion Ring ExpEriment) is a new research
facility at
of two
electrostatic ion storage rings with 8,6 meters circumferences and
with a
common section for merged ion beams experiments. The two rings and
their
vacuum chamber are cooled to 10 Kelvin by which most ions relax to
their
lowest electronic and vibrational ground states during long time
storage. By
this, it is possible to study collisions between internally cold
positive
and negative ions at kinetic energies ranging down to the meV
range.
DESIREE is the first instrument at which this is possible. The
commissioning
work is well under way and 10 keV atomic and molecular ion
beams have
been trapped and 1/e ion storage times of several minutes have
been
measured. The physical pressure is in the 10^-14 mbar range at 13
Kelvin. The
DESIREE rings are also well suited for studies of stabilities
and
photo-absorption features of internally cold molecules. Experiments with
ion beams
of atoms, molecules, clusters, and bio-molecules are possible.
First
results using an Electro Spray Ion Source and ion beams of Polycyclic
Aromatic
Hydrocarbons will be discussed briefly.