Atomic scattering factor of the ASTRO-H (Hitomi) SXT reflector around the gold's L edges

Naomichi Kikuchi, Sho Kurashima, Manabu Ishida, Ryo Iizuka, Yoshitomo Maeda, Takayuki Hayashi, Takashi Okajima, Hironori Matsumoto, Ikuyuki Mitsuishi, Shigetaka Saji, Toshiki Sato, Sasagu Tachibana, Hideyuki Mori, Finn Erland Christensen, Nicolai Brejnholt, Kiyofumi Nitta, Tomoya Uruga

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The atomic scattering factor in the energy range of 11.2-15.4 keV for the ASTRO-H Soft X-ray Telescope (SXT) is reported. The large effective area of the SXT makes use of photon spectra above 10 keV viable, unlike most other X-ray satellites with total-reflection mirror optics. Presence of gold's L-edges in the energy band is a major issue, as it complicates the function of the effective area. In order to model the area, the reflectivity measurements in the 11.2-15.4 keV band with the energy pitch of 0.4-0.7 eV were made in the synchrotron beamline Spring-8 BL01B1. We obtained atomic scattering factors f1 and f2 by the curve fitting to the reflectivities of our witness sample. The edges associated with the L-I, II, and III transitions are identified, of which the depths are found to be roughly 60% shallower than those expected from the Henke's atomic scattering factor.
Original languageEnglish
JournalOptics Express
Issue number22
Pages (from-to)25548-25564
Publication statusPublished - 2016

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