Beitrag zur Erforschung der Bandenfluoreszenz des Cadmiumdampfes

Zeitschrift für Physik A Hadrons and nuclei - Es wurde die Van der Lingensche Fluktuationsbande im Fluoreszenzspektrum des Cadmiumdampfes in Abhängigkeit von der Anregungsart untersucht....     

Zur Kenntnis der Fluoreszenz des Quecksilberdampfes

Zeitschrift für Physik A Hadrons and nuclei - 1. Anschließend an die Ergebnisse einer früheren Arbeit, über welche kurz berichtet wird, wird die Emission der Linie λ 1849...     

Die Fluoreszenz von Z1-Zentren in KCl

Zeitschrift für Physik A Hadrons and nuclei - Detailed measurements on the absorption, emission and excitation spectra of Z1 centers in KCl doped with Ca, Sr or Ba are reported. Beyond the...     

Direkte Konzentrationsabhängigkeit der Fluoreszenz einer Haupt- und einer Nebenlinie des Rubins

The concentration dependence of theR-lines of ruby shows three characteristic regions: The first has the expected linear increase of emission intensity with increasing concentration; the second shows a weaker increase than linear and is explained by the assumption, that energy is distributed more to nebenlines; the third shows a rapid decrease of the emission as is expected for quadrupole-quadrupole interaction between the active atoms. The emission of theN ₂-line of ruby increases nearly quadratically with increasing concentration and decreases in the third region as fast as theR-lines.     

Fluoreszenz hydroxydhaltiger Alkalihalogenide

Alkali halides doped with OH^?-ions show a characteristic fluorescence in the near UV which is excited in the ultraviolett OH^?-absorption band. It consists of several equidistant broad bands, the spacing of which corresponds to the infrared OH^?-absorption. The temperature dependence of the half width, the quantum yield and the decay time was measured in various alkali halides. A radiationless process obeying an Arrhenius law with an activation energy between 0.03 and 0.33 eV depending on the lattice, quenches the fluorescence at high temperature. Just before its onset the decay time amounts to 4 · 10^?5 sec in KI, 6 · 10^?5 sec in KBr and 10^?6 sec in KCl and the quantum yield is approx. 1/3 in KI and KBr and 10^?3 in KCl. At low temperatures the decay time in KI and KBr increases considerably and the quantum yield in KCl decreases still more. The radiative process obviously has to be activated thermally. In KCl it is always by far exceeded by another radiationless process.     

Die Deutung des Energie-Impuls-Tensors des Dirac-Feldes

By comparing the structure of the particle current and of the energy and momentum density, the meaning of the various tensor components is clarified. We decompose the energy momentum tensor into two parts. The one describes orbital, the other spin properties.