NDLI: Atomic emission spectroscopy of laser-induced plasmas generated with an annular-shaped laser beam

Content Provider	Royal Society of Chemistry (RSC)
Author	Laserna, J. J. Cabalín, L. M.
Copyright Year	2004
Abstract	A new optical configuration for focusing laser radiation in laser ablation has been tested. The system uses a combination of an axicon and two plano-convex lenses placed along the beamline. With this set-up, the second harmonic of a flat top pulsed Nd∶YAG laser beam was used to generate an annular plasma on the sample surface. The morphology of the axicon-generated craters was studied for variable focal positions. The annular plasma images were acquired with an intensified charge-coupled device with the imaging spectrograph in zero order. Time-resolved features of these images were studied as a function of beam focal conditions. A spectroscopy characterization of the annular plasmas in terms of electron temperature and electron density was carried out. These parameters presented similar trends and fell from 11800 K to 8400 K and from 2.1 × 1017 cm3 to 1.3 × 1017 cm3, respectively, within a 100–400 ns delay time interval. The results demonstrate that at early times (200 ns) the electron density inside the plasma can be sufficient for secondary excitation of particulate matter.
Starting Page	445
Ending Page	450
Page Count	6
File Format	HTM / HTML PDF
ISSN	02679477
Volume Number	19
Issue Number	4
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/b315856j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Laser Laser ablation Beamline Harmonic Blood plasma Charge-coupled device Spectroscopy Particulates
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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