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Das Thermische Plasma Als Intensitäts Normalstrahler Im Wellenlängenbereich Von 1100 Bis 3100 å by G. Boldt is a Physics and Astronomy article available to read on EtoBox.

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In this paper a standard intensity source is described consisting of a thermal argon plasma with small additives of hydrogen, nitrogen, and carbon dioxide. These gases are introduced in such a concentration to produce a series of optically thick spectral lines in the region 1100/~ to 3100/~. The intensity in an optically thick line center is given by the Kirchhoff-Planck-function B~. (T) which is determined if the plasma temperature is known. The continuous character of the function allows for interpolation between the spectral lines. At longer wave lengths above 1800/~ only two car'con I-lines are found to be optically thick. Here the optically thin argon continuum is calibrated against the carbon Mines and is used as an additional standard emission. By this procedure an absolute intensity scale is constructed at every wave length between 1100 and 3100 ~. The precision of the absolute intensities depends essentially on the precision of the temperature measurement for the plasma. Four different spectroscopic methods are used for this determination giving a temperature of 12540 K with an error of • 1% to • 2 %. This means an error of :t-10 % to ~ 20 ~ for the absolute intensity scal

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Author

G. Boldt

Publisher

Springer Netherlands; Springer-Verlag; Kluwer Academic Publishers; Springer Science and Business Media LLC (ISSN 0038-6308)

Published

1970

Language

EN

Field

Physics and Astronomy (Physical Sciences)