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 recorded from 1 to 11.5 eV and scattering angles from 30-degrees to 90-degrees. 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 known optically allowed transitions and resolve the almost-equal-to 6 eV 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 excitations 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 transitions. The elastic DCS at 7 eV and a scattering angle of 30-degrees is estimated to be of order 5 x 10(-14) cm2/sr.