TY - JOUR
T1 - Long-term performance and durability of Ir/B4C multilayer x-ray mirrors: focusing on composition, structure, and reflectivity properties
AU - Jafari, Atefeh
AU - Ferreira, Desiree D. M.
AU - Kadkhodazadeh, Shima
AU - Kasama, Takeshi
AU - Massahi, Sonny
AU - Svendsen, Sara
AU - Vu, Lan M.
AU - Henriksen, Peter L.
AU - Balogh, Zoltàn M.
AU - Krumrey, Michael
AU - Cibik, Levent
AU - Christensen, Finn E.
AU - Shortt, Brian
PY - 2020
Y1 - 2020
N2 - Multilayer (ML) thin film coatings have shown promise in achieving hard x-ray nanofocusing with high reflectivity and high resolution. The chemical, structural, and long-term stability of Ir/B4C MLs, which are of great interest to the synchrotron and astrophysics communities, are not yet fully understood. The evolution of the x-ray performance of Ir/B4C ML mirrors was monitored over 5 years, and the chemical and structural properties were investigated in depth. Reflectivity scans reveal significant alteration in the energy range of 3.4 to 10 keV over this period. Furthermore, thickness and density degradation of B4C layers were observed in scanning electron transmission microscopy results. The oxidation of B4C occurs only for the top layers, whereas the buried B4C layers go through various complex chemical modifications. The x-ray reflectivity model of Ir/B4C structure was modified, based on the experimental findings, and resulted in good understanding of the long-term reflectivity performance of the x-ray mirror coatings.
AB - Multilayer (ML) thin film coatings have shown promise in achieving hard x-ray nanofocusing with high reflectivity and high resolution. The chemical, structural, and long-term stability of Ir/B4C MLs, which are of great interest to the synchrotron and astrophysics communities, are not yet fully understood. The evolution of the x-ray performance of Ir/B4C ML mirrors was monitored over 5 years, and the chemical and structural properties were investigated in depth. Reflectivity scans reveal significant alteration in the energy range of 3.4 to 10 keV over this period. Furthermore, thickness and density degradation of B4C layers were observed in scanning electron transmission microscopy results. The oxidation of B4C occurs only for the top layers, whereas the buried B4C layers go through various complex chemical modifications. The x-ray reflectivity model of Ir/B4C structure was modified, based on the experimental findings, and resulted in good understanding of the long-term reflectivity performance of the x-ray mirror coatings.
KW - X-ray mirror
KW - Multilayer
KW - Reflectivity
KW - Electron microscopy
KW - Thin film
U2 - 10.1117/1.JATIS.6.3.034005
DO - 10.1117/1.JATIS.6.3.034005
M3 - Journal article
SN - 2329-4124
VL - 6
JO - Journal of Astronomical Telescopes, Instruments, and Systems
JF - Journal of Astronomical Telescopes, Instruments, and Systems
IS - 3
M1 - 034005
ER -