Abstract
As part of the program to calibrate X-ray CCD detectors for the AXAF mission we have performed high-spectral resolution, absolute measurements of CCD quantum efficiency using the synchrotron radiation and grating monochromator facilities of the PTB radiometry laboratory at BESSY. We present here detailed measurements of the absolute quantum efficiency in the spectral region surrounding the oxygen K absorption edge for both front- and back-illuminated MIT Lincoln Laboratory CCDs. The absolute scale of the measurements is established by reference to an Electrical Substitution Radiometer. Near-edge absorption structure produces variations as large as 40% in the detection efficiency of the front-illuminated detectors. We find structure at energies immediately below the K absorption edge which we attribute to resonant absorption. The amplitude of edge structures in the back-illuminated devices is, as expected, much smaller. Finally, we demonstrate that edge structure can be reliably detected in CCD response using an electron impact source and a grating monochromator.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
