Electron energy-loss spectra of fullerene C60 in the gas phase

✍ Scribed by Christophe Bulliard; Michael Allan; Sydney Leach

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 417 KB
• Volume: 209
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(93)80113-4

✦ Synopsis

Electron energy-loss spectra of gaseous fullerene CGD were measured in the energy-loss range l-10 eV and with residual energies l$ from 0.08 to 20 eV. The spectrum recorded with E,=20 eV, with distinct bands at 2.24, 3.77, 4.88 and 6.1 eV, resembles the UV absorption spectrum except for a higher relative intensity of the lowest band at 2.2 eV. The 6. I eV band correlates with a 6.4 eV band observed in solid state EELS and confirms the single molecule nature of this excitation (collective excitation of the x electrons) in the solid. In spectra recorded at lower I?,, where forbidden transitions are further enhanced, the relative intensity of the 2.2 eV band increases further, and a sharp peak emerges at 2.98 eV. Additional signals are recorded around 3.4 and 4.4 eV, without forming new distinct bands. The lowest triplet state, reported at 1.6 ?O. I eV, is missing in the present spectra. Possible transition assignments of the EEL spectra are discussed. Comparison of gas phase and solid state spectra permits identification of solid state specific features.