Ion-molecule reaction dynamics and application to collisions of alkali ions with fullerenes
A triple sector tandem mass spectrometer was built for the investigation of ion-molecule interaction. The mass spectrometer consists of an ion beam source, a single focusing magnetic sector mass selector, a glass reaction cell with a radio-frequency octapole ion guide, a double focusing electric and magnetic sector mass selector, and a Daly ion detector. This spectrometer has been successfully employed in experiments of collisions of inert gas ions and alkali ions with C[sub 60]/C[sub 70] fullerenes in gas phase. The collision-induced dissociation, endohedral complex formation, and thermionic emission of these reaction systems are studied. The collision energy analysis of Ne[sup +] + C[sub 60] reaction provides evidence of endohedral complex formation and C[sub 2]-loss fragmentation. The appearance energy of [NeOC[sub 58]][sup +] is [approximately]25 eV, as well as one of C[sup +][sub 58]. [NeOC[sub 60]][sup +] is hardly observed, which may be due to the high internal energy caused by Ne insertion. Only products of even number carbon loss are observed. The appearance energies of these products are almost evenly spaced. The research studies presented in this dissertation will concentrate on the reactions of alkali ions with C[sub 60] and C[sub 70] molecules. The collision energy analysis illustrates that the appearance energies of adduct formation are about 6, 20, and 48 eV for increasing size Li[sup +], Na[sup +], and K[sup +] projectiles, respectively. The ionization channels C[sub 60][sup +] and C[sub 70][sup +] were observed at [approximately]30 eV collision energy. The sequential C[sub 2] loss is the major fragmentation channel of endohedral complexes and ionized fullerenes. The competition between the fragmentation, thermionic emission, and photon emission has been discussed. The preliminary results on cluster research are presented briefly. The design of a Smalley's type cluster source is described and the conditions of cluster formation are characterized.
- Research Organization:
- State Univ. of New York, Stony Brook, NY (United States)
- OSTI ID:
- 7068182
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALKALI METAL COMPLEXES
ION-MOLECULE COLLISIONS
FULLERENES
DISSOCIATION
THERMIONIC EMISSION
MASS SPECTROMETERS
CARBON
COLLISIONS
COMPLEXES
ELEMENTS
EMISSION
ION COLLISIONS
MEASURING INSTRUMENTS
MOLECULE COLLISIONS
NONMETALS
SPECTROMETERS
664300* - Atomic & Molecular Physics- Collision Phenomena- (1992-)