Abstract
Absolute x-ray emission has been measured when Ar17+ ions at 255 keV collide either with atomic gaseous targets of Ar or N2, with Ar clusters or with thin carbon foils. Preliminary results show a strong decrease of the x-ray signal with the backing pressure of the cluster supersonic jet compared to ion-atom interaction. This effect is a clear signature of slow highly charged ions interacting with clusters. Additionally, high resolution x-ray technique gives us access to the charge state distribution of the emitting ions.
Highlights
Interaction of slow Highly Charged Ions (HCI) with matter is of great interest in various fields as, for example, in astrophysical plasmas [1], in surface modifications [2, 3] or in capillary ion guiding [4]
A Bragg crystal spectrometer enables us to determine the electronic structure of the excited states of emitting ions with a high resolution in the case of atoms and thin solids
It is worth mentioning that when a jet is used as a target, the silicon drift detectors (SDD) are equipped with long designed collimators in which a diaphragm is inserted to get rid of background contribution
Summary
Interaction of slow Highly Charged Ions (HCI) with matter is of great interest in various fields as, for example, in astrophysical plasmas [1], in surface modifications [2, 3] or in capillary ion guiding [4]. When the projectile enters inside the solid, this process is in time competition with the relaxation (radiative and Auger) effects of the ion [9, 13] through multiple step collisions In both cases, i.e., either with atom [7, 14] or solid (bulk or surfaces) [15], x-ray spectroscopy techniques of excited states of HCIs formed by capture of target electrons have proved to be a very powerful tool to study the interaction dynamics. A Bragg crystal spectrometer enables us to determine the electronic structure of the excited states (np population or KxLy configuration) of emitting ions with a high resolution in the case of atoms and thin solids. It is worth mentioning that when a jet (atomic or cluster jet) is used as a target, the SDDs are equipped with long designed collimators in which a diaphragm is inserted to get rid of background contribution
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