Electron impact excitation of delayed ionization of C[sub 60]. Evidence for Rydberg states

A supersonic molecular beam apparatus with a quadrupole mass spectrometer has been used to study the delayed ionization of C[sub 60] by electron impact. Time-of-flight (TOF) analysis through the quadrupole is used to separate the direct ionization of C[sub 60] from delayed ionization. The excitation...

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Bibliographic Details
Published in:Journal of physical chemistry (1952) 1994-03, Vol.98:12
Main Authors: Gallogly, E.B., Bao, Y., Han, K., Lin, H., Jackson, W.M.
Format: Article
Language:English
Subjects:
360600 > Other Materials
CARBON
CROSS SECTIONS
DYNAMIC MASS SPECTROMETERS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXCITATION FUNCTIONS
EXCITED STATES
FERMIONS
FORBIDDEN TRANSITIONS
FULLERENES
FUNCTIONS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
IONIZATION
LEPTONS
MASS SPECTRA
MASS SPECTROMETERS
MATERIALS SCIENCE
MEASURING INSTRUMENTS
MULTIPOLES
NONMETALS
QUADRUPOLES
RYDBERG STATES
SPECTRA
SPECTROMETERS
TIME-OF-FLIGHT MASS SPECTROMETERS
TIME-OF-FLIGHT SPECTROMETERS 400201 > Chemical & Physicochemical Properties
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Summary:A supersonic molecular beam apparatus with a quadrupole mass spectrometer has been used to study the delayed ionization of C[sub 60] by electron impact. Time-of-flight (TOF) analysis through the quadrupole is used to separate the direct ionization of C[sub 60] from delayed ionization. The excitation function for this delayed ionization has been measured as a function of electron energy. The threshold for the excitation function is 32 eV, with a peak at 46 eV and a full width at half-maximum of only 15 eV. It is suggested that the excitation function is closely related to the cross section and that the shape of this function indicates a forbidden transition may be excited. The relative magnitudes of the delayed ionization signals are almost independent of the mass setting of the quadrupole which has been used to suggest that most of the delayed ionization signal results from field ionization of a long-lived Rydberg state from C[sub 60]. 25 refs., 5 figs.
ISSN:0022-3654
1541-5740
DOI:10.1021/j100063a014