remove HTML file

<HTML>

<CENTER><A HREF = "http://lammps.sandia.gov">LAMMPS WWW Site</A> - <A HREF = "Manual.html">LAMMPS Documentation</A> - <A HREF = "Section_commands.html#comm">LAMMPS Commands</A> 

</CENTER>

<HR>

<H3>pair_style atm command 

</H3>

<P><B>Syntax:</B>

</P>

<PRE>pair_style atm args = cutoff 

</PRE>

<P><B>Examples:</B>

</P>

<PRE>pair_style 2.5

pair_coeff * * * 0.072 

</PRE>

<PRE>pair_style	hybrid/overlay lj/cut 6.5 atm 2.5

pair_coeff	* * lj/cut 1.0 1.0

pair_coeff	* * atm * 0.072 

</PRE>

<P><B>Description:</B>

</P>

<P>The <I>atm</I> style computes a 3-body <A HREF = "#Axilrod">Axilrod-Teller-Muto</A>

potential for the energy E of a system of atoms as

</P>

<CENTER><IMG SRC = "Eqs/pair_atm.jpg">

</CENTER>

<P>where r12, r23 and r31 are the distances between the atoms,

gamma1 is included by the sides r12 and r31

with similar definitions for gamma2 and gamma3,

nu is the three-body interaction strength (energy times distance^9 units).

</P>

<P>The <I>atm</I> is typically used in compination with some two-body potential

using <A HREF = "pair_hybrid.html">hybrid/overlay</A> style as in an example above.

</P>

<P>The calculations are not undertaken if the distances between atoms satisfy

r12 r23 r31 > curoff^3. Virtual cutoff distance based on a user defined

tolerance tol is not used.

</P>

<P>The Axilrod-Teller-Muto potential file must contain entries for all the

elements listed in the pair_coeff command.  It can also contain

entries for additional elements not being used in a particular

simulation; LAMMPS ignores those entries.

</P>

<P>For a single-element simulation, only a single entry is required

(e.g. 1 1 1).  For a two-element simulation, the file must contain 4

entries (eg. 1 1 1, 1 1 2, 1 2 2, 2 2 2), that

specify ATM parameters for all combinations of the two elements

interacting in three-body configurations.  Thus for 3 elements, 10

entries would be required, etc.

</P>

<HR>

<P><B>Shift, table, tail correction, rRESPA info</B>:

</P>

<P>This pair style does not support the <A HREF = "pair_modify.html">pair_modify</A>

shift, table, and tail options.

</P>

<P>This pair style can only be used via the <I>pair</I> keyword of the

<A HREF = "run_style.html">run_style respa</A> command.  It does not support the

<I>inner</I>, <I>middle</I>, <I>outer</I> keywords.

</P>

<HR>

<P><B>Restrictions:</B>

</P>

<P>This pair style is part of the MANYBODY package.  It is only enabled

if LAMMPS was built with that package.  See

the <A HREF = "Section_start.html#start_3">Making LAMMPS</A> section for more info.

</P>

<P><B>Related commands:</B>

</P>

<P><A HREF = "pair_coeff.html">pair_coeff</A>

</P>

<P><B>Default:</B> none

</P>

<HR>

<A NAME = "Axilrod"></A>

<P><B>(Axilrod)</B>

Axilrod and Teller, J Chem Phys, 11, 299 (1943);

Muto, Nippon Sugaku Butsuri Gakkwaishi 17, 629 (1943).

</P>

</HTML>