Contour plot of the PES (Ref. 35), averaged over the molecule orientations. The CO molecule has the center of mass at the origin, with the O atom in the positive direction. The distances on the - and -axis scales are given in angstroms, and the energy contour levels shown range from in steps of .
Energies (upper panel) and spectral weights (lower panel) of the -type (open circles) and -type (filled circles) series for clusters, as a function of cluster size. The crosses indicate the observed rotational lines positions, shifted by (see text).
Imaginary time correlation function of the CO molecule versor for . Points with error bars (when visible) are the simulation time. Four and three exponential fits are also shown.
Incremental density distribution, , for selected cluster sizes. The distances on the - and -axis scales are in angstroms. The contour levels start from 0.0002 in steps of .
Energy per molecule, (upper panel), and chemical potential, (lower panel), in clusters.
Angular pair distribution function for , 6, and 9. The decline of at large is evident for , still clearly visible for , and not discernible for .
Observed pinhole jet absorption spectra of clusters in the region of the -type transitions. The backing pressure and jet temperature are given for each trace. Assigned values are given by the numbers in circles. Other lines are due to the CO dimer (*), the CO–He complex (h), and the mixed cluster (m).
Observed pinhole jet absorption spectra clusters in the region of the -type transitions. Conditions and intensity scale are similar to Fig. 7. Assigned values are given by the numbers in circles. Other lines are due to the CO dimer (*) and a “ghost” feature due to a weak secondary laser mode (g).
Observed slit and pinhole jet spectra of clusters in the region of the -type transitions. The warmer slit expansion gives rise to new lines, including some tentatively assigned as -type transitions for (see text).
Calculated energies (in ) and spectral weights of the rotational excitations of clusters. Statistical errors on the last digit(s) are indicated in parentheses.
Observed positions of - and -type transitions of clusters (in ).
Tentative assignments for -type transitions of clusters (in ).
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