Multiphoton excitation, dissociation, and ionization of C[sub 60]

Journal Article · Thu Dec 10 04:00:00 EST 1992 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100204a011· OSTI ID:6853054

Wurz, P; Lykke, K R ^[1]

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1. Argonne National Lab., IL (United States)

We show that the interaction of intense laser light in the visible and UV wavelength range with gas-phase C[sub 60] leads to high internal excitation of the parent molecule, rather than direct multiphoton ionization. High internal energies (about 50 eV) are achieved by absorption of 10-20 photons and rapid conversion from electronic to vibrational excitation. Thus, direct ionization of C[sub 60] by multiphoton absorption is in strong competition with other processes, mainly delayed ionization and fragmentation. A wide fluence and wavelength range is investigated to map out the different parameters that characterize these processes. Both delayed ionization and fragmentation have these high internal excitations as common precursors. These processes are successfully modeled by quasi-equilibrium theory. The results of this study indicate for the first time that the majority of ionization for fullerenes results from thermionic electron emission, a process that takes place on the time scale of microseconds. 54 refs., 16 figs., 3 tabs.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 6853054
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 96:25; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
BOSONS
CARBON
CHEMICAL REACTIONS
DECOMPOSITION
DISSOCIATION
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
FULLERENES
IONIZATION
LASER RADIATION
MASSLESS PARTICLES
MATHEMATICAL MODELS
NONMETALS
PHOTOCHEMICAL REACTIONS
PHOTOIONIZATION
PHOTOLYSIS
PHOTONS
RADIATIONS