Luminescence of Atomic Barium in Rare Gas Matrices: A Two-Dimensional Excitation/Emission Spectroscopy Study

The Journal of Physical Chemistry. a
Barry Davis, John G McCaffrey

Abstract

A detailed characterization is made of the distinct sites occupied by atomic barium isolated in the three rare gas hosts Ar, Kr, and Xe in excitation scans extracted from the recorded total 6s6p 1P1 → (6s)21S0 fluorescence. Extensive use has been made of two-dimensional excitation/emission (2D-EE) spectroscopy to achieve a comprehensive characterization for the wide variety of sites present in the Ba/RG matrix systems. The 2D-EE technique has proved to be a very powerful method to probe the effects of strong intersite reabsorption when extensive spectral overlap occurs between emission and resonance 6s6p 1P1 ← (6s)21S0 absorption of barium atoms occupying multiple sites. Two-dimensional excitation/emission scans have also been used in this study to monitor the effects of sample annealing and thereby identify the thermally stable sites of isolation. Sites of the same type occupied by atomic barium in the three host solids are identified in resolved excitation spectra and are associated on the basis of the observed matrix shift versus host polarizability. Following site associations, the photophysical properties of each matrix site were characterized revealing that the Stokes shift was greatest in the blue site, smallest for the ...Continue Reading

References

Jul 20, 2011·The Journal of Chemical Physics·Owen Byrne, John G McCaffrey
Nov 11, 2011·The Journal of Chemical Physics·E JacquetB Gervais

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Citations

Feb 17, 2019·The Journal of Chemical Physics·Dmitry S BezrukovAlexei A Buchachenko
Oct 3, 2019·The Journal of Chemical Physics·Nadezhda N KleshchinaAlexei A Buchachenko

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