GAMGI 0.12

Nine MC simulations of atom deposition on a substrate, each one
with 44,000 atoms, to study the best conditions to achieve thin,
well defined tracks, corresponding to a total of 396,000 atoms,
all represented here as solid spheres. Each system is in a different,
transparent layer, with different observer coordinates, so the
atom coordinates are unchanged. To get the proper positioning,
each system was initially simulated by an orthorhombic cell
with the same size, replaced in the end by the system, editing
directly the file. Maura E. Monville, Oak Ridge National Laboratory.
Size: 80,265 bytes.

Voronoi tesselation, with periodic boundary conditions, of 10,000 atoms, randomly positioned (on the left), and randomly positioned with a minimum distance between them (4.05% of the cell width), corresponding to a hard-sphere model (on the right). The Voronoi polyhedra obtained are more smooth and regular for the restricted random (Laguerre) than for the purely random (Poisson) distribution. A. Ferro, N. Reis and C. Pereira, Technical University of Lisboa. Size: 65,495 bytes.

Orthorhombic cell containing 50,000 Cu atoms, forming a random close packing (RCP) structure, with a density (occupied volume / total volume) of 0.627. The structure was obtained using the Jodrey algorithm with periodic boundary conditions. Increasing the relaxation time, the density increases slightly (in the range 0.62-0.64, as found experimentaly in the random packing of large numbers of equal spheres). Size: 171,181 bytes.

This multi-layer nanostructure was built linking 38x26x5 cP lattice cells (a = 1.0) with substrate and adatoms (radius = 0.5). By sucessively changing the cell origin, the GAMGI occupancy rules can be used to create arbitrary, well defined, blocks of atoms, forming structures such as the one seen in the picture (see detailed procedure in the tutorial). Size: 78,354 bytes.

GAMGI old

Screenshots for older releases can be found here.