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The UV induced photoluminescence (PL) of activated and reduced surface molybdenum compounds on silica gel has been studied at various concentrations of the products under He and Ar and at various temperatures from R.T. to 10 K. With the activated molybdenum(VI) compounds, four different types of broad band emissions were observed and assigned to definite surface species of Mo(VI): A blue PL occurring mainly at T &gt; -90 °C, two "white" emissions with different spectral excitation regions and Stokes shifts appearing very strongly under He or vacuum below T &lt; -90 °C and a yellow PL occurring with the products under Ar, N2 or C02 instead of the "white" ones.

zeitschrift für naturforschung b

Über die Photolumineszenz von Oberflächenverbindungen des Molybdäns auf Silicagel / On the Photoluminescence of Molybdenum Surface Compounds on Silicagel Supports