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We present a molecular dynamics simulation scheme that we apply to study the time evolution of the self-organized growth process of metal cluster assemblies formed by sputter-deposited gold atoms on a planar surface. The simulation model…

Materials Science · Physics 2016-05-20 J. W. Abraham , T. Strunskus , F. Faupel , M. Bonitz

Gold nanoclusters have been the focus of numerous computational studies but an atomistic understanding of their structural and dynamical properties at finite temperature is far from satisfactory. To address this deficiency, we investigate…

Mesoscale and Nanoscale Physics · Physics 2018-11-13 Diego Guedes-Sobrinho , Weiqi Wang , Ian Hamilton , Juarez L. F. Da Silva , Luca M. Ghiringhelli

In a series of three papers, we introduced a novel cluster formation model that describes the formation, growth, and disruption of star clusters in high-resolution cosmological simulations. We tested this model on a Milky Way-sized galaxy…

Astrophysics of Galaxies · Physics 2020-03-18 Hui Li , Oleg Gnedin

We study conditions under which carbon clusters of different sizes form and stabilize. {We describe an approach to equilibrium by simulating tenuous carbon gas dynamics to long times.} First, we use reactive molecular dynamics simulations…

Astrophysics of Galaxies · Physics 2015-06-18 N. Patra , P. Kral , H. R. Sadeghpour

Molecular dynamics simulations of nanometer-sized lead clusters have been performed using the Lim, Ong and Ercolessi glue potential (Surf. Sci. {\bf 269/270}, 1109 (1992)). The binding energies of clusters forming crystalline (fcc),…

Condensed Matter · Physics 2009-10-31 S. C. Hendy , B. D. Hall

Star clusters - open and globulars - experience dynamical evolution on time scales shorter than their age. Consequently, open and globular clusters provide us with unique dynamical laboratories for learning about two-body relaxation, mass…

Astrophysics · Physics 2007-05-23 Georges Meylan

We use molecular dynamics simulations to study the melting of gold icosahedral clusters of a few thousand atoms. We pay particular attention to the behavior of surface atoms, and to the equilibrium shape of the cluster. We find that…

Materials Science · Physics 2009-11-10 Yanting Wang , S. Teitel , Christoph Dellago

Observations indicate blue globular clusters have half-light radii systematically larger than those of red globular clusters. In this paper, we test whether the different metallicity-dependent stellar evolution timescales and mass-loss…

Astrophysics of Galaxies · Physics 2012-07-26 Rafael Schulman , Evert Glebbeek , Alison Sills

Recent observations show that small, young, stellar groupings of ~10 to 40 members tend of have a centrally-located most massive member, reminiscent of mass segregation seen in large clustered systems. Here, we analyze hydrodynamic…

Astrophysics of Galaxies · Physics 2015-06-18 Helen Kirk , Stella S. R. Offner , Kayla Redmond

Low-dimensional free-standing aggregates of bare gold clusters are studied by the molecular dynamics simulation. Icosahedra of 55 and 147 atoms are equilibrated at T=300 K. Then, their one- and two-dimensional assemblies are investigated.…

Materials Science · Physics 2007-05-23 G. Bilalbegovic

We have performed large-scale Lennard-Jones molecular dynamics simulations of homogeneous vapor-to-liquid nucleation, with $10^9$ atoms. This large number allows us to resolve extremely low nucleation rates, and also provides excellent…

Chemical Physics · Physics 2014-04-07 Raymond Angélil , Jürg Diemand , Kyoko K. Tanaka , Hidekazu Tanaka

This study investigates the structural stability of ionized gold clusters of sizes ranging from 22 to 100 atoms, contrasting compact, cage and planar structures. While it is well known that neutral clusters in the upper part of this size…

Materials Science · Physics 2026-02-18 Mohammad Ismaeil Safa , Ehsan Rahmatizad Khajehpasha , Stefan Goedecker

In this paper we present the results of two detailed N-body simulations of the interaction of a sample of four massive globular clusters in the inner region of a triaxial galaxy. A full merging of the clusters takes place, leading to a…

Astrophysics · Physics 2009-11-13 R. Capuzzo-Dolcetta , P. Miocchi

The freezing behavior of gold nanoclusters was studied by employing molecular dynamics simulations based on a semi-empirical embedded-atom method. Investigations of the gold nanoclusters revealed that, just after freezing, ordered…

Atomic and Molecular Clusters · Physics 2009-11-07 H. -S. Nam , Nong M. Hwang , B. D. Yu , J. -K. Yoon

We present a detailed molecular-dynamics study of the melting, freezing, and coalescence of gold nanoclusters within the framework of the embedded-atom method. Concerning melting, we find the process to first affect the surface…

Materials Science · Physics 2009-10-30 Laurent J. Lewis , Pablo Jensen , Jean-Louis Barrat

The structural evolution of laser-excited systems of gold has previously been measured through ultrafast MeV electron diffraction. However, there has been a long-standing inability of atomistic simulations to provide a consistent picture of…

Materials Science · Physics 2024-06-19 J. M. Molina , T. G. White

Depending on the pH value and salt concentration of Al2O3 suspensions different microstructures can form. Especially the clustered one is of major interest for industrial purposes as found in the production of ceramics. In this paper we…

Soft Condensed Matter · Physics 2007-07-23 Martin Hecht , Jens Harting , Hans J. Herrmann

Molecular dynamics simulations show that gold clusters with about 600--3000 atoms crystallize into a Mackay icosahedron upon cooling from the liquid. A detailed surface analysis shows that the facets on the surface of the Mackay icosahedral…

Materials Science · Physics 2009-11-10 Yanting Wang , S. Teitel , Christoph Dellago

From spectrophotometric and chemical evolutionary modelling of interacting and merging galaxies we predict abundances of burst stars and of globular clusters (GCs) that may be formed in strong bursts. Observations of young GCs in merger…

Astrophysics · Physics 2007-05-23 Uta Fritze - v. Alvensleben , Andi Burkert

We investigate the properties and evolution of star particles in two simulations of isolated spiral galaxies, and two galaxies from cosmological simulations. Unlike previous numerical work, where typically each star particle represents one…

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