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My independent scientific career started as a staff scientist at SSRL. Upon my arrival in 1977, I decided to work in the challenging soft x-ray region, which at the time was largely inaccessible, owing to the unavailability of ultra-smooth optics and the omnipresent carbon contamination on the optical elements in grating monochromators which depressed the photon flux in the 250 - 1000 eV range. In the 1000 - 2000eV range, where crystal monochromators can be used it was difficult to obtain monochromator crystals with suitable d-spacings which could withstand the incident x-ray power. Earlier synchrotron radiation research had therefore focused on the ultraviolet region below about 40 eV, where near normal incidence optics could be used, and on the x-ray region above 4 keV, where conventional monochromator crystals like Si were readily available and the radiation could be brought into air through berillium windows. My goal as a staff scientist at SSRL was to open up the soft x-ray region which provides access to the K absorption edges of the chemically important elements carbon, nitrogen, oxygen, aluminum, silicon, and sulfur, to the important L absorption edges of the 3d metals, especially the magnetic materials iron, cobalt and nickel, and the M edges of the rare earths.
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arxiv(2024)
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C. Stamm, C. Murer,Y. Acremann,M. Baumgartner,R. Gort, S. Däster,A. Kleibert,K. Garello,J. Feng,M. Gabureac,Z. Chen,J. Stöhr,
PHYSICAL REVIEW Bno. 2 (2019): 024426
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