Wspólnotowy Serwis Informacyjny Badan i Rozwoju - CORDIS

Multi-element trace analysis of high-purity substances by mass spectrometric methods

Theoretical and experimental investigations of the glow discharge (GD) plasma were carried out. Detailed estimations of the radio frequency glow discharge (RFGD) plasma gas temperature were obtained. The possibility of creation of the different ion sources for GD was demonstrated both experimentally and theoretically. This involved: a combined RFGD ion source for both elemental and molecular analysis; a complementary RFGD ion source for mass spectrometric analysis; development of a GD ion source for the transformation of liquids in low temperature plasma.

Direct current (DC) glow discharge mass spectrometry can also be used to analyse massive non conducting samples with the use of a so called secondary cathode. A complementary RFGD ion source which can be interfaced to low and high resolution mass spectrometers has been developed and tested. Optimization of the operating parameters of an RFGD ion source and energy separation of analyte ions from spectral background ion species results in an increasing of the signal to background ratio of about two orders of magnitude. To improve analytical performance an RF GDMS for trace analysis of glasses and ceramics a magnetically enhanced RF Planar Magnetron GD ion source has been elaborated. The possibility of combined RFGD ion source for both elemental and molecular analysis was experimentally shown. Indium gallium arsenic phosphide epilayers designed for fabrication of the new family of highly effective infrared light emitting diodes (IR-LED) operating at the wavelength 1.66 um were found to be well lattice-matched, dislocation free and of good structural quality. A model of the strain assisted phase was elaborated and experimentally proved. A new type of the selective methane gas sensor has been developed and fabricated on the basis of IR-LED. It is designed for the remote control of self-explosive concentrations of methane gas via fibre-optics line up to the distance of 2 x 1 km.

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