Absolute density measurement of SD radicals in a supersonic jet at the quantum-noise-limit

Arin Mizouri, Lianzhong Deng, Jack S. Eardley, N. Hendrik Nahler, Eckart Wrede, David Carty

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The absolute density of SD radicals in a molecular beam has been measured down to $(1.1\pm0.1)\times10^5$ cm$^{-3}$ in a modestly specified apparatus that uses a cross-correlated combination of cavity ring-down and laser-induced fluorescence detection. Such a density corresponds to $215\pm21$ molecules in the probe volume at any given time. The quantum-noise-limited noise-equivalent absorption sensitivity of the apparatus was found to be $(3.5\pm0.3)\times10^{-11}$ cm$^{-1}$ Hz$^{-1/2}$ based on a 200 s acquisition time at 10 Hz, therefore competing favourably with more sophisticated techniques.
Original languageEnglish
Pages (from-to)19575-19579
Number of pages5
JournalPhysical Chemistry Chemical Physics
Issue number15
Early online date9 Aug 2013
Publication statusPublished - 2013


  • Atomic Physics
  • Chemical Physics


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