compute_ackland_atom.txt
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	"LAMMPS WWW Site"_lws - "LAMMPS Documentation"_ld - "LAMMPS Commands"_lc :c

	:link(lws,http://lammps.sandia.gov)
	:link(ld,Manual.html)
	:link(lc,Section_commands.html#comm)

	:line

	compute ackland/atom command :h3

	[Syntax:]

	compute ID group-ID ackland/atom :pre

	ID, group-ID are documented in "compute"_compute.html command
	ackland/atom = style name of this compute command :ul

	[Examples:]

	compute 1 all ackland/atom :pre

	[Description:]

	Defines a computation that calculates the local lattice structure
	according to "(Ackland)"_#Ackland.

	In contrast to the "centro-symmetry
	parameter"_compute_centro_atom.html this method is stable against
	temperature boost, because it is based not on the distance between
	particles but the angles. Therefore statistical fluctuations are
	averaged out a little more. A comparison with the Common Neighbor
	Analysis metric is made in the paper..

	The result is a number which is mapped to the following different
	lattice structures:

	1 = UNKNOWN
	2 = BCC
	3 = FCC
	4 = HCP
	5 = ICO :ul

	The neighbor list needed to compute this quantity is constructed each
	time the calculation is performed (i.e. each time a snapshot of atoms
	is dumped). Thus it can be inefficient to compute/dump this quantity
	too frequently or to have multiple compute/dump commands, each of
	which computes this quantity.-

	[Restrictions:] none

	[Related commands:]

	"compute centro/atom"_compute_centro_atom.html

	[Default:] none

	:line

	:link(Ackland)
	[(Ackland)] Ackland, Jones, Phys Rev B, 73, 054104 (2006).