Thermal energy assisted heavy atom effect: Fluorescence quenching of 9-cyanoanthracene in the supercritical fluid of Xe

Makoto Maeda, Urs Graf, Hiromichi Niikura, Masami Okamoto, Satoshi Hirayama

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11 Citations (Scopus)


The fluorescence lifetime, Tf, of 9-cyanoanthracene (9CNA) in the supercritical fluid (SF) of Xe (6.8 MPa at 293 K) is found to be 2.39 ± 0.13 ns, which is much shorter than the 17.78 ± 0.43 ns measured in SF of CO2. This large decrease in Tf is interpreted in terms of the vibronic-level-dependent heavy atom effect which is revealed by a comparison of the absorption and fluorescence excitation spectra measured for the 1:1 van der Waals complex of 9CNA with Xe generated in a supersonic jet. The effect of the temperature on Tf observed in Xe is concordant with the vibronic-level-dependent heavy atom effect.

Original languageEnglish
Pages (from-to)175-180
Number of pages6
JournalChemical Physics Letters
Issue number1-2
Publication statusPublished - 1996 Jul 19
Externally publishedYes


ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

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