Laser desorption mass spectrometry of photopolymerized C[sub 60] films

Journal Article · Thu May 13 04:00:00 EDT 1993 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100121a030· OSTI ID:6260748

Cornett, D S; Amster, I J; Ducan, M A ^[1]; Rao, A M; Eklund, P C ^[2]

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1. Univ. of Georgia, Athens (United States)
2. Univ. of Kentucky, Lexington (United States)

Laser desorption mass spectra are presented for thin films of C[sub 60] (pristine films) and photopolymerized C[sub 60] (transformed films). At the threshold energy for laser desorption, C[sub 60][sup +] is the only product of desorption/ ionization of either film. At intermediate laser energies, transformed films yield ions with the composition (C[sub 60])[sub N][sup +] (N = 1-8), while pristine films produce only C[sub 60][sup +]. At higher desorption laser energies, the transformed films are found to form C[sub 60] cluster ions with N values of up to 20. At higher resolving power, the mass spectra of the cluster ions show substantial structure, dominated by loss of units of C[sub 2x] (x = 0-9) from integer multiples of C[sub 60]. At high desorption laser energy, pristine films also produce C[sub 60] cluster ions, but with a substantially reduced distribution of sizes compared to the transformed films. Comparisons of these data are made to mass spectra of recently reported giant fullerenes. 18 refs., 5 figs.

• OSTI ID: 6260748
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:19; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
400201 -- Chemical & Physicochemical Properties
400500 -- Photochemistry
CARBON
CHEMICAL REACTIONS
DESORPTION
ELEMENTS
FILMS
FULLERENES
IONIZATION
LASERS
MASS SPECTROSCOPY
NONMETALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PHOTOCHEMICAL REACTIONS
POLYMERIZATION
POLYMERS
SORPTION
SPECTROSCOPY
THIN FILMS