Abstract

The authors have investigated the vacuum spark, which is utilized in the spectroscopic study of highly charged ions. One merit of the vacuum spark is its ability to produce a stable spot plasma between the electrodes. Another is its flexibility in selection of characteristic X-ray emission wavelengths, because many metals can be used for this purpose. To make a stable spot plasma, it is important to select the proper arrangement and shape of the electrodes. The authors have examined relationships between electrode shape and X-ray intensity, electrode material and X-ray intensity, electrode shape and X-ray emission sites and soft X-ray wavelengths for various electrodes. Mainly aluminum, molybdenum, and copper electrodes were utilized. X-rays were emitted when a pulse current of about 150 kA flowed and increased as the current flow became larger. A high X-ray intensity was obtained when using a spherical anode and conical cathode and a stable spot plasma was produced. In the case of molybdenum the 0.52-nm line and the 0.65-1.2-nm continuum were confirmed. In the case of the aluminum alloy, which contained magnesium, the 0.62-, 0.66-, 0.78-, and 0.92-nm lines were confirmed. >

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