Photoionization of the CF3 Free Radical

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Abstract
The photoionization cross‐section curve in the wavelength region 1420–860 Å was obtained for the CF3 radical. The shape of the onset of the ionization efficiency curve shows that the adiabatic ionization potential of the radical is much lower than the vertical one, and hence that the equilibrium configuration of the CF3+ ion is very different from that of the molecule. Autoionization probably accounts for some of the ionization near threshold. The ionization potential obtained was I.P.(CF3)=9.25±0.04 eV. The photoionization efficiency curve for aniline was determined in the process of calibrating a nickel photoelectric detector.