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Time-Resolved Temperature-Jump Infrared Spectroscopy at a High Repetition Rate

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Author(s)

  • Gregory M Greetham
  • Ian P Clark
  • Benjamin Young
  • Robby Fritsch
  • Lucy Minnes
  • Neil T Hunt
  • Mike Towrie

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Publication details

JournalAPPLIED SPECTROSCOPY
DateE-pub ahead of print - 2 Mar 2020
Original languageEnglish

Abstract

Time-resolved temperature-jump infrared absorption spectroscopy at a 0.5 to 1 kHz repetition rate is presented. A 1 kHz neodymium-doped yttrium aluminum garnet (Nd:YAG) laser pumping an optical parametric oscillator provided >70 µJ, 3.75 µm pump pulses, which delivered a temperature jump via excitation of the O-D stretch of a D2O solution. A 10 kHz train of mid-infrared probe pulses was used to monitor spectral changes following the temperature jump. Calibration with trifluoroacetic acid solution showed that a temperature jump of 10 K lasting for tens of microseconds was achieved, sufficient to observe fast processes in functionally relevant biomolecular mechanisms. Modeling of heating profiles across ≤10 µm path length cells and subsequent cooling dynamics are used to describe the initial <100 ns cooling at the window surface and subsequent, >10 µs cooling dynamics of the bulk solution.

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