Present and future CCDs for UV and X-ray scientific measurements

Significant advances in CCD performance are reported. Specifically, interacting quantum efficiency of > 50% is demonstrated throughout the spectral range of 6009,000 A, with comparable sensitivity expected to continue to wavelengths as short as a few Angstroms. Non-dispersive X-ray spectra, throughout the 250-8000 eV range, have been obtained with an FWHM spectral resolution of 200-250 eV. At present, both spatial and spectral resolution is limited, at some energies, by the diffusion of photo-generated charge into more than one picture element. A detailed model of this diffusion is described and evaluated on the basis of measured performance