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1

Hadamard Spectrometry for Thermoluminescence Investigations

100%

Oczkowski H.

Acta Physica Polonica A

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1992

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vol. 82

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issue 3

367-375

EN

A Hadamard encoded spectrometer with a special variable interference filter allows attaining high throughput and sensitivity. In our instrument the interference filter is fixed between condenser lenses. The transmitted wavelength changes continuously along the length of the filter. The multislit cyclic Hadamard mask moves step by step behind the filter to multiplex signal. Some details concerning the data recording, handling and decoding are specific for this technique of investigation of thermoluminescence spectrum.

2

Charge Traps in Ce-Doped CaF_{2} and BaF_{2}

51%

Drozdowski W., Przegiętka K., Wojtowicz A., Oczkowski H.

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vol. 95

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issue 2

251-258

EN

Thermoluminescence of CaF_{2}:Ce, BaF_{2}, and BaF_{2}:Ce irradiated at room temperature is reported. X-ray induced emission spectra of the samples show that both excitonic (due to e^{-}+V_{K} recombination) and Ce^{3+} d-f luminescence may contribute to thermoluminescence signal. The simple Randall-Wilkins model is used to deconvolute glow curves into seven to eight first-order peaks. Parameters of all traps are calculated and correlations between peaks in the curves of the examined materials are discussed.

3

Trap Spectra of Annealed Quartz

51%

Chruścińska A., Oczkowski H., Przegiętka K.

Acta Physica Polonica A

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1996

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vol. 89

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issue 4

555-568

EN

The trap energy density spectra of natural quartz were investigated by the fractional glow technique. The thermal treatment before excitation induces the changes of thermoluminescence sensitivity as well as the changes of trap spectrum. After annealing at temperature higher than 400°C, a new kind of trap is observed. The frequency factor was determinated by the fitting of the theoretical glow curve calculated using the trap depth measured by fractional glow technique to experimental one.

4

Measurement System for Fractional Glow Technique

51%

Pietkun A., Polakiewicz L., Oczkowski H.

Acta Physica Polonica A

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1992

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vol. 81

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issue 6

687-691

EN

Some details of computerized arrangement for recording fractional thermoluminescence at high temperatures are presented. The investigation of energy distribution of traps for quartz crystals exemplifies the measurement procedure and data handling.

5

Luminescence from β-Irradiated Graphene Layers

45%

Chruścińska A., Przegiętka K., Szroeder P., Oczkowski H., Rozpłoch F.

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EN

We found that β-irradiated samples of crystallite graphite and multi-walled carbon nanotubes emit light during heating above room temperature. This behaviour is rather surprising for semimetals. Due to the lack of deep enough energy gap, this optical emission cannot be associated with interband transitions, as it is usually assumed in a thermally stimulated luminescence model. We suppose that the reported accumulated luminescence is the result of thermally stimulated relaxation of some kind of defects created in graphene structures by ionising radiation and therefore we offer to name it the relaxoluminescence. We anticipate the relaxoluminescence to be a starting point for developing a new spectroscopic method for nanotechnology. It can also throw a new light on the nature of defects, which are suspected of being responsible for strange magnetic effects in carbon.

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Hadamard Spectrometry for Thermoluminescence Investigations

Charge Traps in Ce-Doped CaF_{2} and BaF_{2}

Trap Spectra of Annealed Quartz

Measurement System for Fractional Glow Technique

Luminescence from β-Irradiated Graphene Layers