X-ray spectroscopy of ion-surface interactions using superconducting tunnel junctions

Physics

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Atomic, Molecular, And Ion Beam Impact And Interactions With Surfaces, X-Ray Emission Spectra And Fluorescence, X- And Gamma-Ray Sources, Mirrors, Gratings, And Detectors, Superconducting Optical, X-Ray, And Gamma-Ray Detectors

Scientific paper

We have conducted low energy X-ray spectroscopy of ion/surface interactions with superconducting tunnel junction (STJ) detectors. The STJ detectors (Nb-Al-AlOx-Al-Nb) developed at the Lawrence Livermore National Laboratory have a high energy resolution and a high count-rate capability. The detectors are operated in an adiabatic demagnetization refrigerator with 60 mK base temperature at the end of a 40 cm long cold finger, which can be inserted into a UHV sample chamber connected to an ion source. We have studied the interaction of Ar9+, O7+, N6+ and C5+ with various targets (Au, SiH and SiO2) at a kinetic energy of 10 keV/q. The resolution of 12-15 eV below 1 keV allows the different satellite lines emitted by these ions to be separated. .

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