Abstract

A method for calibrating vacuum-ultraviolet monochromators for measurement of absolute radiation intensities is described. It is based on calculating the brightness of an optically thin spectral line in the far ultraviolet from the brightness of a visible line originating from the same upper level. A grazing incidence monochromator and a Seya–Namioka monochromator were calibrated at a number of wavelengths between 1640 and 231 Å, using line pairs of hydrogen and ionized helium. Light sources used to obtain these lines are described. Problems of measurement and sources of error, particularly in the case of hydrogenlike spectra, are discussed.

© 1963 Optical Society of America

Absolute Intensity Measurements in the Vacuum Ultraviolet*†

James A. R. Samson
J. Opt. Soc. Am. 54(1) 6-15 (1964)

Intensity Measurements in the Vacuum Ultraviolet

K. Watanabe and Edward C. Y. Inn
J. Opt. Soc. Am. 43(1) 32-35 (1953)

Thermocouple Measurements of Spectral Intensities in the Vacuum Ultraviolet*

Donald M. Packer and Charles Lock
J. Opt. Soc. Am. 41(10) 699-701 (1951)

Metal Photocathodes as Secondary Standards for Absolute Intensity Measurements in the Vacuum Ultraviolet*

R. B. Cairns and J. A. R. Samson
J. Opt. Soc. Am. 56(11) 1568-1573 (1966)

Intense Resonance Line Sources for Photochemical Work in the Vacuum Ultraviolet Region

Hideo Okabe
J. Opt. Soc. Am. 54(4) 478-481 (1964)