Low-energy electron attachment to C[sub 60]

The attachment of low-energy electrons to C[sub 60] is studied using crossed beam reactions between an effusive beam of C[sub 60] molecules and either a monochromatic beam of low-energy electrons or a beam of higly excited Rydberg atoms. A low-energy threshold (approximately 0.15 = 0.05 eV) for the...

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Bibliographic Details
Published in:Journal of physical chemistry (1952) 1995-02, Vol.99:6
Main Authors: Huang, J., Carman, H.S. Jr, Compton, R.N.
Format: Article
Language:English
Subjects:
400102 - Chemical & Spectral Procedures
664200 - Spectra of Atoms & Molecules & their Interactions with Photons- (1992-)
ATOMIC AND MOLECULAR PHYSICS
ATOMS
BEAMS
CARBON
COLLISIONS
ELECTRON ATTACHMENT
ELECTRON BEAMS
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ELEMENTS
ENERGY LEVELS
ENERGY SPECTRA
EXCITED STATES
FULLERENES
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
LEPTON BEAMS
MASS SPECTROMETERS
MEASURING INSTRUMENTS
MOLECULE COLLISIONS
MOLECULES
NONMETALS
PARTICLE BEAMS
QUANTUM NUMBERS
RYDBERG STATES
SPECTRA
SPECTROMETERS
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Summary:The attachment of low-energy electrons to C[sub 60] is studied using crossed beam reactions between an effusive beam of C[sub 60] molecules and either a monochromatic beam of low-energy electrons or a beam of higly excited Rydberg atoms. A low-energy threshold (approximately 0.15 = 0.05 eV) for the the attachment of free electrons is observed, indicating that s-wave capture is absent, in agreement with theoretical predictions. Resonance structured at 0.2, 1.5, 4.5, 5.5, and 8 eV are attributed to electron attachment into higher electronic states of the manifold of negative ion states of C[sub 60]. In contrast, the charge-exchange reaction rate between high Rydberg (np) alkali atoms and C[sub 60] exhibits an n dependence similar to that observed for SF[sub 6] (s-wave capture) but has a somewhat smaller attachment rate constant. The apparent conflict between slow free electron attachment and the charge transfer data is attributed to the fact that the electric field arising from the ion core of the Rydberg atom breaks the symmetry of the electron/molecule collison, allowing direct attachment into the ground state of the negative ion with no angular momentum barrier. 55 refs., 8 figs.
ISSN:0022-3654
1541-5740
DOI:10.1021/j100006a013