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Absolute photon-flux measurements in the vacuum ultravioletAbsolute photon-flux measurements in the vacuum ultraviolet have extended to short wavelengths by use of rare-gas ionization chambers. The technique involves the measurement of the ion current as a function of the gas pressure in the ion chamber. The true value of the ion current, and hence the absolute photon flux, is obtained by extrapolating the ion current to zero gas pressure. Examples are given at 162 and 266 A. The short-wavelength limit is determined only by the sensitivity of the current-measuring apparatus and by present knowledge of the photoionization processes that occur in the rate gases.
Document ID
19740038103
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Samson, J. A. R.
Haddad, G. N.
(Nebraska, University Lincoln, Neb., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1974
Publication Information
Publication: Optical Society of America
Subject Category
Physics, General
Accession Number
74A20853
Funding Number(s)
CONTRACT_GRANT: NAS5-23125
Distribution Limits
Public
Copyright
Other

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