Development of a broadband picosecond infrared spectrometer and its incorporation into an existing ultrafast time-resolved resonance raman, UV/visible, and fluorescence spectroscopic apparatus

Michael Towrie, David C. Grills, Joanne Dyer, Julia A. Weinstein, Pavel Matousek, Robin Barton, Philip D. Bailey, Naresh Subramaniam, Wai M. Kwok, Chensheng Ma, David Phillips, Anthony W. Parker, Michael W. George

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

We have constructed a broadband ultra fast time-resolved infrared (TRIR) spectrometer and incorporated it into onr existing time-resolved spectroscopy apparatus, thus creating a single instrument capable of performing the complementary techniques of femto-/pi-cosecond time-resolved resonance Raman (TR3), fluorescence, and UV/visible/infrared transient absorption spectroscopy. The TRIR spectrometer employs broadband (150 fs, ~150 cm-1 FWHM) mid-infrared probe and reference pulses (generated by difference frequency mixing of near-infrared poises in type I AgCaS2), which are dispersed over two 64-element linear infrared array detectors (HgCdTe). These are coupled via custom-built data acquisition electronics to a personal computer for data processing. This data acquisition system performs signal handling on a shot-by-shot basis at the 1 kHz repetition rate of the pulsed laser system. The combination of real-time signal processing and the ability to normalize each probe and reference pnlse has enabled os to achieve a high sensitivity on the order of AOD ~ 10-4-10-5 with 1 min of acqui-ition time. We present preliminary picosecond TRIR studies using Jiis spectrometer and also demonstrate how a combination of TRIR and TR3 spectroscopy can provide key information for the full elucidation of a photochemical process.

Original languageEnglish
Title of host publicationThe Life and Scientific Legacy of George Porter
PublisherImperial College Press
Pages454-467
Number of pages14
ISBN (Electronic)9781860948930
ISBN (Print)1860946607, 9781860946608
DOIs
Publication statusPublished - Jan 1 2006

Keywords

  • Array detector
  • Broadband
  • Charge-trans-fer excited states
  • DNA probes
  • Fluorescence
  • Infrared
  • Kerr gate
  • Photopolymerization initiators
  • Resonance Raman
  • Ultrafast time-resolved spectroscopy

ASJC Scopus subject areas

  • Arts and Humanities(all)
  • Chemistry(all)

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    Towrie, M., Grills, D. C., Dyer, J., Weinstein, J. A., Matousek, P., Barton, R., Bailey, P. D., Subramaniam, N., Kwok, W. M., Ma, C., Phillips, D., Parker, A. W., & George, M. W. (2006). Development of a broadband picosecond infrared spectrometer and its incorporation into an existing ultrafast time-resolved resonance raman, UV/visible, and fluorescence spectroscopic apparatus. In The Life and Scientific Legacy of George Porter (pp. 454-467). Imperial College Press. https://doi.org/10.1142/9781860948930_0009