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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 43,
  • Issue 1,
  • pp. 16-19
  • (1989)

Microsecond Time-Resolved Infrared Spectroscopy of a Thin Film of τ-Form Metal-Free Phthalocyanine Fine Particles

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Abstract

A microsecond time-resolved infrared spectrometer has been constructed. It is based on a dispersive infrared spectrometer modified for fast gated detection with a boxcar integrator synchronized with the photoexcitation by a high-repetition-rate cw Q-switched Nd: YAG laser. Time-resolved infrared spectra of τ-form metal-free phthalocyanine (τ-H<sub>2</sub>Pc) fine particles have been obtained with a gate width of 0.5 μs. It is most probable that the triplet exciton of τ-H<sub>2</sub>Pc and its bimolecular decay process (triplet-triplet annihilation) have been observed.

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