pair_zhou docs: add equation, add link in section_commands and pairs

doc/src/Eqs/pair_zhou.tex

@@ -0,0 +1,13 @@
+\documentclass[12pt,fleqn]{article}
+\usepackage{amsmath}
+\thispagestyle{empty}
+
+\begin{document}
+
+\setlength{\jot}{2ex}
+\begin{gather*}
+  E = D_0 [\exp^{-2 \alpha (r-r_0)} - 2\exp^{-\alpha (r-r_0)}] - s_6 \frac{C_6}{r^6} f_{damp}(r,R_r) \\
+  f_{damp}(r,R_r) = \frac{1}{1 + \exp^{-d(r/R_r - 1)}}
+\end{gather*}
+
+\end{document}

doc/src/Section_commands.txt

@@ -1060,7 +1060,8 @@ package"_Section_start.html#start_3.
 "table/rx"_pair_table_rx.html,
 "tersoff/table (o)"_pair_tersoff.html,
 "thole"_pair_thole.html,
-"tip4p/long/soft (o)"_pair_lj_soft.html :tb(c=4,ea=c)
+"tip4p/long/soft (o)"_pair_lj_soft.html,
+"zhou"_pair_zhou.html :tb(c=4,ea=c)
 
 :line
 

doc/src/pair_zhou.txt

@@ -13,15 +13,15 @@ pair_style zhou command :h3
 pair_style zhou cutoff s6 d :pre
 
 cutoff = global cutoff (distance units)
-s6 = global scaling factor of the exchange-correlation functional used
-d = damping scaling factor of Grimme's method :ul
+s6 = global scaling factor of the exchange-correlation functional used (unitless)
+d = damping scaling factor of Grimme's method (unitless) :ul
 
 [Examples:]
 
 pair_style zhou 12.0 0.75 20.0
-pair_style hybrid/overlay eam/fs lj/charmm/coul/long 10.0 12.0 zhou 12.0 0.75 20.0 morse 5.5
+pair_style hybrid/overlay eam/fs lj/charmm/coul/long 10.0 12.0 zhou 12.0 0.75 20.0 morse 5.5 :pre
 
-pair_coeff 1*4 5 zhou 0.0 1.0 1.0 10.2847 2.361
+pair_coeff 1 2 zhou 0.0 1.0 1.0 10.2847 2.361 :pre
 
 [Description:]
 
@@ -31,6 +31,19 @@ force field described extensively in "(Fichthorn)"_#Fichthorn and
 "(Zhou)"_#Zhou. This potential is widely used to correct for dispersion
 in density functional theory calculations.
 
+:c,image(Eqs/pair_zhou.jpg)
+
+For the {zhou} pair style, the following coefficients must be defined for each
+pair of atoms types via the "pair_coeff"_pair_coeff.html command as in the
+examples above, or in the data file or restart files read by the 
+"read_data"_read_data.html as described below:
+
+D0 (energy units)
+alpha (1/distance units)
+r0 (distance units)
+C6 (energy*distance^6 units)
+Rr (distance units) :ul
+
 :line
 
 :link(Grimme)

doc/src/pairs.txt

@@ -101,5 +101,6 @@ Pair Styles :h1
    pair_yukawa_colloid
    pair_zbl
    pair_zero
+   pair_zhou
 
 END_RST -->