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Zeitschrift für Physik A Hadrons and nuclei - Es werden die wichtigsten Ergebnisse der in der folgenden Liste angeführten Arbeiten über Verfärbung und Lumineszenz durch...  相似文献   

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Dispersion and scattering cross section of the bulk plasma losses of Al and Mg are compared with plasma theory. The low lying Mg loss shows an asymmetric intensity distribution for non-normally incident electrons and an angular dependence of intensity as expected from the theory of surface losses. In very thin Al films, coupling effects between the two opposite surfaces are found, causing some new properties of the surface losses. Especially a thickness dependent dispersion of the surface loss is measured which is quite different from that of the bulk losses and characteristic for surface excitation.  相似文献   

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The temperature dependence of the luminescence of AgCl-Tl single crystals in the red region of the spectrum was measured. The curves have a characteristic beginning in the 50–70 K region, peaks at 70–100K and at 190K followed by a rapid fall. The dependence of the luminescence intensity on that of the exciting radiation is linear in the range measured. The experiments point to the complex character of the centre and the probability of energy transfer between the absorption and luminescence centres.

Ich betrachte es gerne als meine Pflicht, an dieser Stelle den Herren Prof. Dr. O. Stasiw und Dr. Koswig meinen Dank auszusprechen für ihre Bereitwilligkeit, mit der sie mir ermöglichten, im Tieftemperaturlaboratorium des Instituts zu arbeiten, sowie für die wertvollen Diskussionen.  相似文献   

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In an emission electron microscope with ion induced electron emission the dependence of emission current and cathode sputtering under ion bombardment on discharge voltage, type of discharge gas and specimen material is measured. If high image intensity and little cathode sputtering is desired, a discharge gas of small molecular mass and high ion energies should be used. Under such conditions it is possible to observe a specimen in an emission microscope over a longer period without appreciable specimen changes due to cathode sputtering during observation.  相似文献   

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