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

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

Research output: Contribution to journalArticle

Abstract

We describe a novel experimental setup that combines the advantages of both laser-induced fluorescence and cavity ring-down techniques. The simultaneous measurement of the ring-down and fluorescence signals from the same sample in a single laser beam delivers the calibration of the fluorescence measurement to gain absolute quantities: absorption cross section, sample density and fluorescence quantum yield. At the same time, the fluorescence measurement extends the dynamic range of a stand-alone cavity ring-down setup from typically three to at least six orders of magnitude. The methodology of this combined cavity-enhanced laser-induced fluorescence (CELIF) technique is developed and rigorously tested against the spectroscopy of 1,4-bis(phenylethynyl)benzene in a molecular beam and density measurements in a cell.
Original languageEnglish
Pages (from-to)1-24
Number of pages25
JournalJournal of Chemical Physics
Early online date8 Aug 2013
Publication statusE-pub ahead of print - 8 Aug 2013

Keywords

  • physics.chem-ph
  • physics.optics

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