On the Possibility of Observing Negative Fluorescence Dips in Laser-Induced Fluorescence Experiments

Authors: Simeonsson, J. B.1; Smith, B. W.1; Winefordner, J. D.1; Omenetto, N.2

Source: Applied Spectroscopy, Volume 45, Issue 4, Pages 521-714 (May 1991) , pp. 521-523(3)

Publisher: Society for Applied Spectroscopy

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Abstract:

Some theoretical considerations are given which show how a negative fluorescence dip (i.e., an increase in the monitored fluorescence signal) can be obtained when one is performing two-step excitation experiments in atmospheric pressure atomizers. Such an inverted dip is due to an increased population of the fluorescent level, caused by cascade de-excitation, both radiational and collisional, from the upper level(s) reached with the second excitation step. No coherence effects are involved. These considerations are supported by the experimental observation of the inverted dip in the stepwise, nonresonance fluorescence of silver atoms present in an inductively coupled argon plasma.

Keywords: Dip spectroscopy; Fluorescence; Laser excitation; Negative fluorescence dip

Document Type: Rapid Communication

DOI: http://dx.doi.org/10.1366/0003702914336787

Affiliations: 1: Department of Chemistry, University of Florida, Gainesville, Florida 32611 2: Department of Chemistry, University of Florida, Gainesville, Florida 32611; permanent address: Commission of the European Communities, Joint Research Centre, Environment Institute, Ispra (Varese), Italy

Publication date: May 1, 1991

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