Berlin 2001 – wissenschaftliches Programm

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A: Atomphysik

A 5: Posters Tuesday (Photoionisation, Multi Photon Processes)

A 5.41: Poster

Dienstag, 3. April 2001, 12:30–15:00, AT3

Laser-Induced Plasma Spectroscopy (LIPS) in the VUV for the Quantitative Characterisation of Steel Alloys — •Mohamed Khater, Eugene Kennedy, John Costello, Jean-Paul Mosnier, and Paul van Kampen — National Centre for Plasma Science and Technology (NCPST), Dublin City University, Dublin 9, Ireland

We demonstrate that spatially resolved spectroscopy, in the deep VUV region (40-160 nm), of laser induced plasmas provides a useful technique for quantifying the carbon content in steel target materials. Three ionisation stages of carbon have been investigated using a series of solid steel samples with carbon concentrations in the 0.001-1.32% range.

The original CEMA/PDA detector have been replaced by a VUV-sensitive CCD array and an extensive optimisation study for several experimental parameters and conditions have been carried out. Our latest results provide a significant reduction in the detection limit to 2 ppm of carbon.