Photodetachment of electrons from large molecular systems: Cyclopentadienide and methylcyclopentadienide ions. An upper limit to the electron affinities of C5H5· and CH3C5H4·

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Abstract
The relative cross sections for the gas phase photodetachment of electrons have been determined for cyclopentadienide ions in the wavelength region 270–670 nm (4.59−1.85 eV) and for methylcyclopentadienide ions in the wavelength region 270–730 nm (4.59−1.70 eV). An ion cyclotron resonance spectrometer was used to generate, trap, and detect the negative ions and a 1000 W xenon arc lamp with a grating monochromator was employed as the light source. Both ions exhibited a monotonically increasing cross section over the entire wavelength region; consequently, only upper limits to the electron affinities could be determined: E.A. (C5H5 ·) ≤ 1.84±0.03 eV and E.A. (CH3C5H4 ·) ≤ 1.67±0.04 eV.

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