Abstract

A stationary hydrogen arc discharge may be used as a standard source of radiation in the VUV below 100 nm. The Lyman resonance continuum is used, the cross sections of which are theoretically well known. The method described is based on optically thin radiation, requiring high plasma temperatures and an effective helium gas separation in the arc. The investigations demonstrate that, in appropriate experimental conditions, the plasma is indeed transparent down to the onset of the He ground-state absorption. Above that, the VUV spectral radiance can be predicted within less than 15% uncertainty from conventional plasma diagnostics. For a first application, the He continuum has been measured between 65 nm and 92 nm. The consistency of these results with theoretical calculations confirms the validity of the concept presented.

© 1979 Optical Society of America

Vacuum ultraviolet radiometry with hydrogen arcs. 2: The high power arc as an absolute standard of spectral radiance from 124 nm to 360 nm

W. R. Ott, K. Behringer, and G. Gieres
Appl. Opt. 14(9) 2121-2128 (1975)

Continuous calibration of a vacuum ultraviolet system from 65 to 125 nm by a cascade arc and comparison with the calibrated line radiation of a hollow cathode

Robert Martin Frost and Peter Awakowicz
Appl. Opt. 36(9) 1994-2000 (1997)

VUV Radiometry with Hydrogen Arcs. 1: Principle of the Method and Comparisons with Blackbody Calibrations from 1650 Å to 3600 Å

W. R. Ott, P. Fieffe-Prevost, and W. L. Wiese
Appl. Opt. 12(7) 1618-1629 (1973)

Vacuum ultraviolet radiometry. 3: The argon mini-arc as a new secondary standard of spectral radiance

J. M. Bridges and W. R. Ott
Appl. Opt. 16(2) 367-376 (1977)

Calibration of radiation detectors in the VUV using a wall-stabilized Ar-cascade arc

H. Kaase and H.-K. Stephan
Appl. Opt. 18(13) 2275-2279 (1979)