Other
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988pasp..100..116o&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 100, Jan. 1988, p. 116-123.
Other
9
A Stars, Astronomical Observatories, Charge Coupled Devices, Quantum Efficiency, Stellar Spectrophotometry
Scientific paper
By making observations of Alpha Lyr with a small quartz-lens telescope and narrow-band filters, the absolute quantum efficiency from 3200 A to 10,000 A has been determined for a standard cooled CCD. Other CCDs are calibrated by direct comparison with this standard device. It is found that for back-illuminated thinned Texas Instruments 800 x 800 CCDs uv flooding or a platinum coating achieve quantum efficiencies of only a few percent if the CCDs are kept in a vacuum at all times. Soaking the CCD in dry oxygen gas increases the uv quantum efficiency to as high as 44 percent for some devices. Other devices reach only 25-30 percent after long soaking in oxygen, and this may occur only if some chlorine treatment is also used.
Harris Fred H.
Oke Bev J.
Oke D. C.
Wang Delong
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