Applications of photothermal beam deflection calorimetry to organic photochemistry

Syun Ru Yeh, Daniel E. Falvey

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Photothermal beam deflection calorimetry (PDC) measures the time-dependent heat release that follows optical excitation of a sample. From these measurements, parameters such as reaction enthalpies and rates can be determined. In this work, it is shown that this method can be conveniently applied to the measurement of intersystem crossing quantum yields, triplet energies and photochemical reaction enthalpy changes in a variety of organic molecules. In general, PDC signals are linear with excitation energy and sample concentration. Also, the rates and enthalpies derived from these measurements show good agreement with literature values. In certain cases, a non-linear response of the signal with respect to the excitation energy is observed. This appears to be the result of multiphoton absorption by the sample. Comparison of PDC with complementary photothermal methods, such as photoacoustic calorimetry and thermal lens calorimetry, is discussed.

Original languageEnglish (US)
Pages (from-to)13-21
Number of pages9
JournalJournal of Photochemistry and Photobiology, A: Chemistry
Issue number1
StatePublished - Mar 8 1995
Externally publishedYes


  • Enthalpy
  • Kinetics
  • Laser effects
  • Photothermal
  • Quantum yields
  • Solvent effects
  • Triplet state

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)


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