Studies of ion-C[sub 60] collisions with a triple sector guided ion beam instrument

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1992

OSTI ID:7072137

Christian, J F

A custom triple sector guided ion beam instrument (3SGIB) has been constructed for the study of ion-molecule collisions. The instrument consists of an ion source, acceleration ion optics, a reagent mass selector, decelerating ion optics, an ion guide, a reaction cell, and a double focusing product mass spectrometer. Collisions of C[sub 60] with the following ions have been studied: Ne[sup +], [sup 13]C[sup +]/[sup 12]C[sup +], C[sup 2+], O[sup +], N[sup +]. The major products resulting from the collision of C[sub 60] with Ne[sup +] are charge transfer (CT) and C[sub 60-2n][sup +] dissociation fragments. Some collisions result in the insertion of the Ne into the C[sub 60] cage, forming the C[sub 60-2n]Ne[sup +] product. The experimental insertion threshold is approximately 25 eV and substantially higher than the dissociation energy. The octapole ion guide discriminates against products that are not scattered toward the detector. At low translational energies, the collision of C[sub 60] with C[sup +] forms the C[sub 61][sup +] adduct. This process is exoergic and has a substantial cross section. The C[sub 61][sup +] adducts is stable, and is observed at collision energies up to 15 eV. The adduct dissociates primarily by C atom loss. Isotopic labeling demonstrates exchange between the added carbon and approximately three carbon atoms in the fullerene cage. Collisions greater than 20 eV produce both CT and C[sup +][sub 60-2n] fragments. Products from the collisions of C[sub 60] and C[sub 70] with C[sub 2+] were comparatively studied. The cross sections for adduct formation of both C[sub 60] and C[sub 70] were very large. The C[sub 60] adduct is observed at collision energies up to 25 eV, where as the C[sub 70] adduct is observed at collision energies of up to 35 eV. Collisions with O[sup +] and N[sup +] are described.

• Research Organization: State Univ. of New York, Stony Brook, NY (United States)
• OSTI ID: 7072137
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
CARBON
CARBON IONS
CHARGED PARTICLES
COLLISIONS
ELEMENTS
FULLERENES
ION COLLISIONS
ION-MOLECULE COLLISIONS
IONS
MOLECULE COLLISIONS
NEON IONS
NITROGEN IONS
NONMETALS
OXYGEN IONS