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

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 spectromet...

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Bibliographic Details
Published in:The Journal of chemical physics 1973-11, Vol.59 (9), p.5068-5076
Main Authors: Richardson, Jeffery H., Stephenson, L. M., Brauman, John I.
Format: Article
Language:English
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Summary: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.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.1680725