Abstract
Mass spectra of LaC n were taken by using a laser-vaporization source (LVS) and pulsed arc cluster ion source (PACIS) applied to La-carbon composite rods (1:130 atomic ratio). The mass spectrum using the LVS with anneal- ing procedure has shown several magic numbers for LaCn (n = 44, 50, 60, and 70), whereas only small LaC n (up to n = 14) have been observed in the mass spectrum using the PACIS. Photoelectron spectra of some of these have been measured using a magnetic-bottle type time-of-fligh elec- tron spectrometer. These results indicate the exsistence of a few conformational isomers for small La-containing carbon cluster negative ions LaC n (n = 5-8).
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