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Luminescence quenching by iron in barium aluminoborate glasses

Made available in DSpace on 2022-04-28T18:53:20Z (GMT). No. of bitstreams: 0 Previous issue date: 1994-01-01; The quenching of the radiative e - h+ recombination in barium aluminoborate glass, x irradiated at 77 K, was investigated by EPR and thermoluminescence (TL) techniques as a function of an iron impurity concentration ranging from 10-3 to 0.1 at. %. The analysis of the EPR line shape of Fe3+, observed in ...

Optical absorption spectroscopy of natural and irradiated pink tourmaline

Phosphorescence in irradiated spodumene

X-Ray fluorescence analysis of Fe, Mn, Cr and V in natural silicate crystals

Optical absorption and electron spin resonance in natural, irradiated and heate...

Medida de tempo para o equilíbrio térmico em cristais de espoduménio

Experiments for measurement of time taken to reach thermal equilibrium in Spodumene crystals — 2mm to 5,4mm thick - in the temperature range 100° to 250°C are described. The measurements indicate a linear relationship between time and thickenes for heating as well as for cooling. Difference in thermal equilibrium time for heating and for cooling is about of 20 seconds. ; Descrição de experimentos de medida de t...

Um método de ajuste da função n(t) = nQ (1+at)b

This paper presents a method to obtain a quick fitting of the function n (t) = n0 (l+at)b. The method calculates the parameters a, b and n0 based on four numerical values of the function n (t). The usefulness of the present method is in estimating initial parameters for iterative fitting methods and in apprais ing the quality of a group of experimental data.; Apresentação de um método para obter rapidamente o a...