Hard X-ray, soft gamma-ray spectroscopy, nuclear lines
Normal incidence reflection with ML coatings**
<1 arcsec (actual)
<0.25 keV ~1% bandwidth
Recent missions, for example, TRACE
Imaging soft X-ray lines in the solar corona
Diffractive-refractive
10 to 100* microarcsec
>4 keV10–20% bandwidth
Laboratory experiments
Central regions of galaxies + jets nearby stars
Interferometer
0.1* microarcsec
0.2 to 10 keV
Laboratory experiments
Imaging the environments of super massive black holes
* Expected resolution. ** multilayer coatings. *** In 2010, the Chandra X-Ray Observatory, XMM-Newton, Suzaku, and Swift XRT Total telescope areas at 1 keV are, respectively, 0.09 m2, 0.43 m2 (3 tel), 0.18 m2 (4 tel), and 0.015 m2.