U. Buck et al., DIFFRACTION AND VIBRATIONAL DYNAMICS OF LARGE CLUSTERS FROM HE ATOM SCATTERING, Zeitschrift fur Physik. D, Atoms, molecules and clusters, 26(1-4), 1993, pp. 169-171
The vibrational dynamics of large Ar(n) clusters from n=30 to n=4500 i
s investigated by measuring the energy loss of He atoms in a high reso
lution scattering experiment. The clusters are generated by adiabatic
expansion through conical nozzles and contain a distribution of cluste
r sizes. The He supersonic nozzle beam provides a resolution of better
than 1 meV. The results are compared with calculated spectral density
functions for single cluster sizes and bulk phonon spectra.