Rigid-Fluid Transition in Specific-Size Argon Clusters

Abstract

Larger argon atomic clusters undergo a size-specific transition from rigid to fluid forms as the cluster temperature is varied. The observed nature of this phase change, detected by measurement of the spectral line shape of a benzene dopant molecule, favors the phase-coexistence model of the cluster melting transition.

High‐Resolution UV Spectroscopy of Molecular Complexes

“…Thus the main source of infor mation has been the shift of the vibronic transitions to the first electronic excited state due to complexation [4 -6] and the width of the vibronic bands [7,8]. In these experiments it has been impossible to selectively excite individual rovibronic quantum states of these complexes that would lead to unambiguous information on the structure and dynamic processes.…”

Spectroscopy of 3, 4, 9, 10-perylenetetracarboxylic dianhydride (PTCDA) attached to rare gas samples: Clusters vs. bulk matrices. I. Absorption spectroscopy

“…Benzenedoped argon clusters show a liquid-solid transition at a cluster size of N = 21. 4 For xenon-doped neon clusters, this transition lies at N = 300. 6 To our knowledge no such studies have been performed involving large doped hydrogen clusters.…”

“…1 In spite of the huge improvements in spectroscopic techniques during the last few decades, fundamental characteristics still remain unclear: no accordance has been found on the cluster size above which the lattice structure changes from fcc to hcp. 2,3 Moreover, small clusters have been assigned to liquid-like behavior [4][5][6] and the cluster size above which these clusters solidify is not yet well-characterized. The study of the above mentioned characteristics is limited by the transparency of rare gas clusters in the visible range, limiting the use of many standard spectroscopic methods.…”

Experimental methods for determining the melting temperature and the heat of melting of clusters and nanoparticles

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