ISSN:
0951-4198
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
The distribution of negative carbon clusters, Cn-, is studied in the size range from 4 to 100 atoms using a Smalley compact supersonic source interfaced to a Fourier transform mass spectrometer. Tht mass spectrum of the anion clusters shows three regions which, based on earlier work, can be assigned to three different types of structures: chain, monocyclic and fullerene. The boundaries observed for the three regions in the mass spectrum suggest that the transition from chain to cyclic structure occurs between Cn- and C14-, and the one from cyclic structure to fullerene occurs in the region of C33- to C59-. Magic numbers in the cyclic cluster region are found to be 17, 21, 25, 29 and 33 (n = 4m + l), and in the fullerene region, 60 and 74. Water can react with carbon clusters in the supersonic source to form hydrogenation products followed by electron attachment to give CnH- and CnH2- (for even n smaller than about 22). With argon as the target gas, only small Cn- (n 〈 14, except n = 4) are observed to undergo low energy collision-induced dissociation (CID) yielding mainly Cn-3-. While CID of CnH- gives Cn-, no product was observed during CID of CnH2-.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/rcm.1290070518
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