Abstract
Graphite ablation in low-pressure nitrogen atmosphere has beencarried out by XeCl excimer laser radiation at the fluenceof 12 J cm-2. The induced-plasma plume has beeninvestigated by time- and space-resolved emission spectroscopy.The recorded spectra are dominated by diatomic molecule bands:the C2 Deslandres-D'Azambuja and Swan systems and the CNviolet system. From experimental measurements, it turns out that the continuum, the atomic emissions and the C2Deslandres-D'Azambuja bands are predominant in the plasma coreregion (d⩽1 mm) at short times, whereas the molecularbands of the Swan and violet systems are very intense in theouter plasma regions. The different temporal and spatial histories of emissions of the different chemical species in theplasma plume could be attributed to the peculiar processesoccurring during plasma expansion.
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