15 research outputs found
Estimation of the natural radionuclides deposition on the land surface in the vicinity of Trypilska thermal power plant
Results of the intercalibration study of laboratories involved in assessing the environmental consequences of the Chernobyl accident
Spatially resolved ultra-trace analysis of elements combining resonanceionization with a MALDI-TOF spectrometer
A combined setup for spatially resolved mass analysis of trace amounts of elements and macromolecules is presented. Using a MALDI-TOF mass spectrometer, a laser spectroscopic setup for resonant ionization of neutral atoms has been implemented. This allows for an efficient and selective detection of trace elements by means of resonance ionization mass spectrometry (RIMS). The instrumental scheme is described, and methodological developments are presented. In a first application pure, laser desorption/ionization with TOF-MS was used to measure mass distributions of cosmic nanodiamonds. For further applications regarding the spatially resolved ultra-trace analysis of elements in solid samples, an implanted target was used to characterize both laser desorption/ionization and laser desorption/resonance ionization for the detection of trace elements within. A perspective of the setup is given and future investigations are outlined
A laser desorption/resonance enhanced photoionisation TOF-system forthe spatially resolved trace analysis of elements
A novel method for direct and spatially resolved elemental trace
analysis with high sensitivity and elemental selectivity is presented.
The concept is based on the combination of a commercial MALDI-TOF mass
spectrometer with a pulsed laser system for resonant postionisation of
neutrals. While the MALDI method is usually applied for investigations
of large organic compounds and biomolecules, the technique discussed
here concerns the low mass range around 1 less than or equal to A less
than or equal to 300. The analytical performances of the setup with
respect to mass analysis, spatial resolution and overall detection
efficiency are discussed. (C) 2004 Elsevier B.V. All rights reserved
Multi-color resonance ionization of laser ablated gadolinium at highlaser power
Spectroscopic and analytical properties of a trace analytical method using multi-step resonance ionization at high laser intensities (>kW/cm2) have been investigated with gadolinium as a test element. Strongly saturated transitions are observed, which have been used for a temperature determination of the atoms in the laser ablated plume. Regimes of multi-step resonance ionization and multiphoton ionization could be distinguished. Analytical performances due to resonance enhancement and resulting discrimination against non-resonant background, precision in isotope ratio determination and overall detection efficiency are discussed