Final Report: Development of Laser Excited Atomic Fluorescence and Ionization Methods, May 1, 1988 - December 31, 1998 Page: 1 of 34
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Development of Laser Excited Atomic Fluorescence and Ionizatip VMahdA
Progress Report for DOE-DE-FG05-88-ER13881 ( c'( 4
J. D. Winefordner, PI
Department of Chemistry n have . .
University of Florida SPandpo1 0 On r a Patent
Gainesville, FL 32611 na tion of this nation or
(352) 392-0556 S e
Proper I'ecua.
Research Objectives e Office, Cha
Laser excited atomic fluorescence and ionization spectrometry are fundamentally e most
sensitive of atomic spectroscopic methods. In principle, single atom detection can be demonstrated
for both techniques. The goal of this research program is to develop these methods for practical
ultratrace elemental analysis in a wide variety of matrices. This is being done through fundamental
studies of atomization processes with the aim of developing optimum atom reservoirs for practical
analysis, studies of laser excitation processes for fluorescence and ionization with the aim of
enhancing our understanding of the dynamics of atom and ion populations in these reservoirs and
finding efficient single and multi-step excitation schemes for many elements, and studies of
techniques for photon and ion detection with the aim of improved analytical performance.
Overview of past four years work
Since the initiation of DOE support for this research program in 1988, a large number of
topics related to the goal of the work have been explored. A total of 49 publications relating to this
research have been published or are in press. In preface to this renewal proposal, we will only
review our work of the past three years.
Progress Report (January 1, 1995 - December 31, 1998)
The progress report is divided into 8 sections including (1) laser ionization, (2) laser
fluorescence in a glow discharge, (3) glow discharge emission/fluorescence, (4) magnetically
enhanced glow discharges for optical emission spectrometry, (5) electrothermal atomization-laser
excited atomic fluorescence, (6) 3-dimensional number density profiles of species in a glow
discharge, (7) laser induced breakdown spectroscopy, LIBS, (8) fundamental studies, and (9) other
studies.
Laser Ionization. Petrucci, et al studied and characterized a resonance ionization detector
(RID) based on the two-step enhanced ionization of indium atoms in an atmospheric pressure
air/acetylene flame. Practical utilization of the RID is shown by recording a partial excitation
spectrum of the OH radical in the same air/acetylene flame used as the detector cell and
measurement of the flame temperature (2516 175) by the Boltzmann plot method. OH transitions
were excited in the X2II; - A2E+ (1,0) vibronic band in the wavelength range 281-288 nm.
A schematic of the general principles of the 2 step-LEI approach for photon detection is
shown in Fig. 1. The transition 1- 2 of the atom M, henceforth termed the detector element, serves
as the signal transition. An atom, M, promoted directly (or indirectly through another level M.) to
level 2, M, by any means, is simultaneously illuminated by an intense laser beam, henceforth termed
the detection laser, tuned to the excited state transition 2 - 3. These highly excited atoms, if1
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Winefordner, J.D. Final Report: Development of Laser Excited Atomic Fluorescence and Ionization Methods, May 1, 1988 - December 31, 1998, report, December 31, 1998; Gainesville, Florida. (https://digital.library.unt.edu/ark:/67531/metadc721113/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.