Comment on ‘‘Temperature-enhanced electron detachment from C6F−6 negative ions’’ [J. Chem. Phys. <b>98</b>, 7875 (1993)]

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  • E. C. M. Chen
    University of Houston-Clear Lake, 2700 Bay Area Blvd., Houston, Texas 77058
  • E. S. D. Chen
    University of Houston-Clear Lake, 2700 Bay Area Blvd., Houston, Texas 77058
  • W. E. Wentworth
    Department of Chemistry, University of Houston, Houston, Texas 77204-5641

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<jats:p>The results of three recent, independent measurements of the electron affinity of C6F6 are discussed. These utilize an electron capture detector (ECD), an atmospheric pressure ionization mass spectrometer (APIMS), and a photoelectron spectrometer (PES). Seven independent measurements of the temperature dependence of the ECD response of C6F6 give an average value of 0.86±0.02 eV for the electron affinity of C6F6 in agreement with an earlier published value. The APIMS and PES studies have been recently published and support the ECD value. On this basis, it is suggested that the value of the electron affinity of about 0.5 eV presented in the subject article refers to an excited electronic state of the anion of C6F6. Morse potential energy curves are calculated for four negative ions states of C6F6 using experimental data.</jats:p>

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