## Abstract

A description is given of a new facility, located at the NBS (Gaithersburg) Synchrotron Ultraviolet Radiation Facility (SURF-II), in which the absolute calibration of working standard detectors for the 5–50-nm spectral region, and the subsequent calibration of outgoing transfer standard detectors is performed. A dual toroidal grating monochromator, with diffraction gratings optimized for 3–13 and 12–52 nm, disperses synchrotron radiation from the electron storage ring into tandem experimental chambers in which a rare gas ionization chamber determines the absolute magnitude of the incident radiant flux and hence the efficiency of the photoemissive photodiodes.

© 1987 Optical Society of America

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### Equations (7)

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(1)
$$I=\frac{i}{e\phantom{\rule{0.1em}{0ex}}[i-exp\phantom{\rule{0.1em}{0ex}}(-uk)\phantom{\rule{0.1em}{0ex}}]}\phantom{\rule{0.2em}{0ex}},$$
(2)
$$C=\frac{{i}_{H}\phantom{\rule{0.2em}{0ex}}[1-exp\phantom{\rule{0em}{0ex}}(-\phantom{\rule{0em}{0ex}}u{k}_{L})\phantom{\rule{0.1em}{0ex}}]}{{i}_{L}\phantom{\rule{0.2em}{0ex}}[1-exp\phantom{\rule{0em}{0ex}}(-\phantom{\rule{0em}{0ex}}u{k}_{H})\phantom{\rule{0.1em}{0ex}}]}\phantom{\rule{0.1em}{0ex}},$$
(3)
$${E}_{1}=\frac{{i}_{D}-{E}_{2}e{I}_{2}}{e{I}_{1}}\phantom{\rule{0.1em}{0ex}}.$$
(4)
$${i}_{1}=\frac{f\phantom{\rule{0em}{0ex}}{Q}_{1}i}{{Q}_{2}{y}_{2}\phantom{\rule{0.1em}{0ex}}(1-f)+f\phantom{\rule{0em}{0ex}}{Q}_{1}{y}_{1}}\phantom{\rule{0.1em}{0ex}},$$
(5)
$${i}_{2}=\frac{i-{i}_{1}{y}_{1}}{{y}_{2}}\phantom{\rule{0.1em}{0ex}},$$
(6)
$$f=\frac{{m}_{2}\phantom{\rule{0.1em}{0ex}}(1-rb)}{r\phantom{\rule{0.1em}{0ex}}({m}_{1}a-{m}_{2}b)+{m}_{2}-{m}_{1}}\phantom{\rule{0.1em}{0ex}},$$
(7)
$$\begin{array}{cc}{m}_{1}={C}_{1}\phantom{\rule{0.1em}{0ex}}(1-a)& {m}_{2}={C}_{2}\phantom{\rule{0.1em}{0ex}}(1-b)\phantom{\rule{0.2em}{0ex}}.\end{array}$$