Physics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt.......107s&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF FLORIDA, 1990.Source: Dissertation Abstracts International, Volume: 52-03, Section: B, page: 1397
Physics
Rare Earth Elements, Spectral Interferences, Plasma Diagnostics
Scientific paper
The application of laser induced fluorescence to the inductively coupled plasma (ICP-LIF) has been demonstrated as a method that is analytically sensitive and selective. Studies have been performed using both single resonance and double resonance laser excitation of ICP-LIF to evaluate the relative merits of the two techniques. Limits of detection are reported for Ag, Au, Ce, Cu, Dy, Er, Pb, Pd, Pt, Sc and Sm and range from sub-part-per-billion to tens of part -per-billion for both approaches. Consideration is also given to the concept of selectivity for the method of ICP -LIF, particularly to the relationship between the laser power and spectral selectivity for certain sample situations. A study of two rare earth elements, Dy and Gd, demonstrates the potential for increased spectral interferences caused by saturation broadening of the excitation profile and suggests that high power laser excitation can cause interferences. In addition, ICP-LIF has been used to perform physical studies of excited state atomic transitions. The technique of fluorescence dip spectroscopy is presented as a demonstration of the unique diagnostic capabilities of ICP-LIF. The experimental results are used to determine selected parameters of excited state transitions and to evaluate the validity of a three level atom steady state model for Ag, Cu, Ir, Pb and Pd. Experimental results for copper atom are also used as an example of how time integrated fluorescence dip determinations can be used to evaluate Einstein coefficients and transition oscillator strengths of excited state transitions.
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