2004/02/12 by Spartak I. Kovalenko, Kovalenko, Spartak I., Oleksandr G. Danylchenko +4
Earth and Planetary Sciences · Physics and Astronomy · #Atomic and Molecular Clusters (physics.atm-clus) #Dust and Plasma Wave Phenomena #FOS: Physical sciences #Quantum, superfluid, helium dynamics #nanoparticles nucleation surface interactions #physics.atm-clus
paper · pdf · doi:10.48550/arxiv.physics/0402063
The more detailed discussion of the obtained results will be published in Fiz. Nizk. Temp. 30 (2004) [Low Temp. Phys. 30 (2004)]
arxiv created 2004/02/12 · openalex publication_date 2004/02/12 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
An electron diffraction technique is used to study the structure of clusters formed in an isentropically expanding supersonic argon jet. The formation of the hcp phase with increasing cluster size is reliably detected for the first time. Observations are made for mean cluster sizes N in the range from 1x103 to 8x104 atoms/cluster. An analysis of the shape of the diffraction peaks is carried out. It is found that in the range N <= 2x103 atoms/cluster, where the clusters are icosahedral, the profiles of the diffraction peaks are well approximated by a Lorentzian. For fcc clusters with N >= 3x103 atoms/cluster a better approximation is the standard Gaussian function. In the case N >= 1x104 atoms/cluster one observes peaks of the hcp phase in addition to the fcc peaks. The intensity of the hcp peaks increases with increasing cluster size, and for N = 8x104 atoms/cluster, the (110), (101), (103), and (202) peaks, characteristic only for the hcp phase, are clearly registered in addition to the fcc peaks. A possible mechanism for the formation of the hcp structure in Ar clusters is proposed.