Untersuchungen an derLII, III-Röntgenemissionsbande von Aluminium mit einem neuen Konkavgitterspektrographen
A concave grating spectrograph (blazed grating, r=2000mm, blaze angle 1°31′, 600 lines/mm; angle of incidence 85°) designed for the wavelength region λ=40... 600 A is described. The X-ray tube is mounted inside the spectrograph and works at a pressure of about 10−8 Torr. The detector is an open photomultiplier with a tungsten photocathode.The sensitivity of the apparatus allows even at low target input (3 kV; 0.5...3.5 mA) the observation of the formation of a carbon layer on the target and the decomposition of compounds by electron bombardement during the course of the measurement.TheLII, III-emission bands of metallic Aluminium and Aluminiumoxide are investigated. The spectra agree on the whole with those published previously, but they show more pronounced structural features. The reasons for the differences are discussed. It appears that most of the emission bands obtained with photographic-photometric registration will have to be remeasured.