CROSSED-BEAM EXPERIMENT FOR THE SCATTERING OF LOW-ENERGY ELECTRONS FROM GAS-PHASE C-60

Elastic electron scattering spectra of C60 in the vapor phase were rec orded from 1 to 11.5 eV and scattering angles from 30-degrees to 90-de grees. Electron energy loss spectra are given for a loss from 1 to 55 eV at impact energies of 50 and 100 eV (5-degrees). They confirm the k nown optically allowed transitions and resolve the almost-equal-to 6 e V pi-electron plasmon-peak at least into four steps at 5.8, 6.1, 6.3, and 6.5 eV. A small peak of width 2 eV has been found at 28.3 eV, the position of the ''sigma+pi-plasmon'' in solid films. Vibrational excit ations were recorded at 7 eV for angles from 20-degrees to 60-degrees with a resolution of 34 meV and show two peaks at 0.06 to 0.11 eV and at 0.15 to 0.20 eV both of which contain optically forbidden transitio ns. The elastic DCS at 7 eV and a scattering angle of 30-degrees is es timated to be of order 5 x 10(-14) cm2/sr.