Journal
JOURNAL OF SYNCHROTRON RADIATION
Volume 22, Issue -, Pages 1359-1363Publisher
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S1600577515015040
Keywords
carbon contamination; in situ carbon removal; chromium-coated optics; carbon K-edge; higher-order harmonics
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Carbon-free chromium-coated optics are ideal in the carbon K-edge region (280-330 eV) because the reflectivity of first-order light is larger than that of gold-coated optics while the second-order harmonics (560-660 eV) are significantly suppressed by chromium L-edge and oxygen K-edge absorption. Here, chromium-, gold- and nickel-coated mirrors have been adopted in the vacuum ultraviolet and soft X-ray branch beamline BL-13B at the Photon Factory in Tsukuba, Japan. Carbon contamination on the chromium- coated mirror was almost completely removed by exposure to oxygen at a pressure of 8 x 10(-2) Pa for 1 h under irradiation of non-monochromated synchrotron radiation. The pressure in the chamber recovered to the order of 10(-7) Pa within a few hours. The reflectivity of the chromium- coated mirror of the second-order harmonics in the carbon K-edge region (560-660 eV) was found to be a factor of 0.1-0.48 smaller than that of the gold-coated mirror.
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