Impact-parameter-dependent multifragmentation of C{sub 60} in charge-changing collisions with 2-MeV C{sup +} ions

Journal Article · Fri Jun 15 04:00:00 EDT 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.75.063203· OSTI ID:20991160

Mizuno, T; Okamoto, D; Tsuchida, H; Itoh, A ^[1]; Majima, T ^[2]; Nakai, Y ^[3]

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1. Department of Nuclear Engineering, Kyoto University, Kyoto 606-8501 (Japan)
2. Genesis Research Institute, Inc., Ichikawa 272-0001 (Japan)
3. RIKEN - Institute of Physical and Chemical Research, Wako, Saitama 351-0198 (Japan)

Multifragmentation of C{sub 60} was investigated for 2 MeV C{sup +} projectile ions by means of a time-of-flight triple coincidence technique. Fragment ions and secondary electrons were measured simultaneously in coincident with charge-selected outgoing projectile particles scattered into forward angles smaller than 1.0 mrad. Fragment ion distributions were found to change remarkably with respect to the scattering angle {theta}. Relationships between {theta} and the impact parameter b measured from the center of C{sub 60} were calculated classically. We found evidently that small-size fragment ions are produced only from cage-penetration collisions, while intact parent ions and their daughter ions are created in collisions nearby but outside a C{sub 60}. Furthermore, charge state distributions of prefragmented C{sub 60}{sup r+} ions and correlated fragment ion pairs were both found to be essentially independent of {theta} when plotted for individual C{sub m}{sup +} ions of fixed size. These results indicate that the production of a size-fixed specific ion may be restricted to a certain impact parameter region in which equivalent electronic energies are deposited irrespectively of {theta}. This was confirmed also from our calculation of the energy deposition as a function of b carried out using the local density approximation.

• OSTI ID: 20991160
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 6 Vol. 75; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
APPROXIMATIONS
ATOMIC CLUSTERS
CARBON IONS
CATIONS
CHARGE EXCHANGE
CHARGE STATES
DENSITY
DENSITY FUNCTIONAL METHOD
DISSOCIATION
DISTRIBUTION
ELECTRON CAPTURE
ELECTRONS
FRAGMENTATION
FULLERENES
IMPACT PARAMETER
ION PAIRS
ION-MOLECULE COLLISIONS
MEV RANGE 01-10
SCATTERING
TIME-OF-FLIGHT METHOD