Absolute fluorescence and absorption measurements over a dynamic range of 106 with cavity-enhanced laser-induced fluorescence

Scott E. Sanders, Oliver R. Willis, Nils Hendrik Nahler, Eckart Wrede

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Abstract

We present a novel spectroscopic technique that exhibits high sensitivity and a large dynamic range for the measurement of absolute absorption coefficients.We perform a simultaneous and correlated laser- induced fluorescence and cavity ring-down measurement of the same sample in a single pulsed laser beam. The combined measurement offers a large dynamic range and a lower limit of detection than either technique on its own. The methodology, dubbed cavity-enhanced laser-induced fluorescence, is developed and rigorously tested against the electronic spectroscopy of 1,4-bis(phenylethynyl)benzene in a molecular beam and density measurements in a cell. We outline how the method can be used to determine absolute quantities, such as sample densities, absorption cross sections, and fluores- cence quantum yields, particularly in spatially confined samples.
Original languageEnglish
Pages (from-to)014201
JournalJournal of Chemical Physics
Volume149
Issue number1
Early online date2 Jul 2018
DOIs
Publication statusPublished - 7 Jul 2018

Keywords

  • cavity ring-down spectroscopy
  • Laser-induced fluorescence
  • fluorescence quantum yield
  • molecular spectroscopy

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