Laser mass spectroscopic investigations of purified, laboratory-produced C60/C70

G. Ulmer, E. E.B. Campbell, R. Kühnle, H. G. Busmann, I. V. Hertel

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Laser desorption mass spectra of Krätschmer's purified "fullerite" have been studied in a reflectron time-of-flight mass spectrometer. Desorption with 308 or 248 nm yields direct ions emerging from the substrate with high efficiency. At low fluence, a distribution of pure C+60 (76%), C+70 (23%) and, perhaps, a small amount C+84 (≤ 1.5%) ions are observed. As the fluence is increased, fragmentation of these species and aggregation to larger clusters are observed. Post-ionisation of neutral desorbed species with 248 or 308 nm is much less efficient and leads to substantial fragmentation both immediately on ionisation as well as in the field-free region of the mass spectrometer (a timescale of up to 100 μs).

Original languageEnglish
Pages (from-to)114-119
Number of pages6
JournalChemical Physics Letters
Issue number2
StatePublished - 26 Jul 1991

Bibliographical note

Funding Information:
The authors would like to thank W. Krltschmer for supplying samples of the purified fullerite. Financial support by the Bundes Ministerium ftir For-schung und Technologie (BMFT) under contract number 13N5628 “Materialbearbeitung mit Exci-merlasern” is gratefully acknowledged.


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