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Use of MgF2 and LiF photocathodes in the extreme ultraviolet.The photoelectric yields of 2000-A thick samples of MgF2 and LiF have been measured at wavelengths in the range from 1216 to 461 A. Peak values of 43 and 34%, respectively, were obtained at wavelengths around 550 A at 45 deg incidence. Coating the cathode of a channel electron multiplier with 3000 A of MgF2 produced no significant deterioration in the electrical properties and increased the sensitivity by factors of 1.62, 2.76, and 2.60 at wavelengths of 742, 584, and 461 A, respectively. Since the stability of response of the MgF2 photocathodes appears to be equal to that of conventional metallic and semiconducting cathodes, it is concluded that MgF2 would be a practical, high-efficiency photocathode for use in the extreme ultraviolet.
Document ID
19730036246
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lapson, L. B.
Timothy, J. G.
(Harvard College Observatory Cambridge, Mass., United States)
Date Acquired
August 7, 2013
Publication Date
February 1, 1973
Publication Information
Publication: Applied Optics
Volume: 12
Subject Category
Instrumentation And Photography
Accession Number
73A21048
Funding Number(s)
CONTRACT_GRANT: NAS5-3949
Distribution Limits
Public
Copyright
Other

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