Investigating the Influence of Combination of Magnetic Field and Various Atmosphere Conditions on LIBS Signal Enhancement
| Autoři | |
|---|---|
| Rok publikování | 2016 |
| Druh | Konferenční abstrakty |
| Fakulta / Pracoviště MU | |
| Citace | |
| Popis | Laser-induced breakdown spectroscopy (LIBS) is a method with great potential in numerous applications and with the capability to detect broad spectrum of elements. Despite the improvement in instrumentation, it still lacks the appropriate sensitivity for some elements, such as detection of halogens. One of the possibilities how to improve the limits of detection is using reduced ambient pressure atmosphere. Consequently, allowing the species to be easily excited and then to emit characteristic radiation. However, using low-pressure ambient atmosphere leads to fast expansion of plasma contributing to lower plasma temperature and electron density. In this work we propose the utilization of magnetic field in order to confine the plasma plume and thus to increase the plasma temperature, electron density resulting to the detected signal. One of the studied parameters was a plasma size for different combinations of ambient pressures and magnetic fields. Concurrently the influence of pressure and magnetic field on signal and background of selected spectral lines was investigated. Optimization of laser intensity and gate delay was performed for each combination of ambient pressure and magnetic field. Moreover for the optimal conditions was monitored plasma temperature using Saha-Boltzmann plots. |
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