more ..

[physik/posic.git] / moldyn.c

diff --git a/moldyn.c b/moldyn.c
index 3424d49..ad0f9a3 100644 (file)
--- a/moldyn.c
+++ b/moldyn.c
@@ -969,7 +969,7 @@ int tersoff(t_moldyn *moldyn) {
        lc=&(moldyn->lc);
        count=moldyn->count;
        
-       /* reset enrgy counter */
+       /* reset energy counter */
        u=0.0;
 
        for(i=0;i<count;i++) {
@@ -995,6 +995,39 @@ int tersoff(t_moldyn *moldyn) {
 
                        /* 2 body stuff */
 
+                       v3_sub(&dist_ij,btom,&(atom[i]));
+                       d_ij=v3_norm(&dist_ij);
+                       if(d_ij<=S) {
+
+                               S=;
+                               R=;
+                               A=;
+                               lambda=;
+                               B=;
+                               mu=;
+                               chi=;
+                               beta=;
+                               betaN=;
+
+                               if(d_ij<=R) {
+                                       f_c=1.0;
+                                       df_c=0.0;
+                               }
+                               else {
+                                       s_r=S-R;
+                                       arg1=PI*(d_ij-R)/s_r;
+                                       f_c=0.5+0.5*cos(arg1);
+                                       df_c=-0.5*sin(arg1)*(PI/(s_r*d_ij));
+                                       f_r=A*exp(-lambda*d_ij);
+                                       f_a=-B*exp(-mu*d_ij);
+                               }
+                       }
+                       else 
+                               continue;               
+
+                       
+                       /* end 2 body stuff */ 
+
                        /* determine cell neighbours of btom */
                        ki=(btom->r.x+(moldyn->dim.x/2))/lc->x;
                        kj=(btom->r.y+(moldyn->dim.y/2))/lc->y;
@@ -1002,6 +1035,10 @@ int tersoff(t_moldyn *moldyn) {
                        ck=link_cell_neighbour_index(moldyn,ki,kj,kk,
                                                     neighbourk);
 
+                       /* go for zeta - 3 body stuff! */
+                       zeta=0.0;
+                       d_ij2=d_ij*d_ij;
+
                        /* cell of btom */
                        thisk=&(neighbourk[0]);
                        list_reset(thisk);
@@ -1013,6 +1050,49 @@ int tersoff(t_moldyn *moldyn) {
                                        continue;
                                
                                /* 3 body stuff (1) */
+                               
+                               v3_sub(&dist_ik,ktom,&(atom[i]));
+                               d_ik=v3_norm(&dist_ik);
+                               if(d_ik<=Sik) {
+
+                               Rik=;
+                               Sik=;
+                               Aik=;
+                               lambda_ik=;
+                               Bik=;
+                               mu_ik=;
+                               omega_ik=;
+                               c_i=;
+                               d_i=;
+                               h_i=;
+                       
+
+                                       if(d_ik<=Rik) {
+                                               f_cik=1.0;
+                                               df_cik=0.0;
+                                       }
+                                       else {
+                                               sik_rik=Sik-Rik;
+                                               arg1ik=PI*(d_ik-Rik)/sik_rik;
+                                               f_cik=0.5+0.5*cos(arg1ik);
+                                               df_cik=-0.5*sin(arg1ik)* \
+                                                      (PI/(sik_rik*d_ik));
+                                               f_rik=Aik*exp(-lambda_ik*d_ik);
+                                               f_aik=-Bik*exp(-mu_ik*d_ik);
+                                       }
+                       
+                                       v3_sub(&distance_jk,ktom,btom);
+                                       cos_theta=(d_ij2+d_ik*d_ik-d_jk*d_jk)/\
+                                                 (2*d_ij*d_ik);
+                                       theta=arccos(cos_theta);
+
+                                       
+                               }
+                               else
+                                       continue;
+
+                               /* end 3 body stuff (1) */
+
 
                        } while(list_next(thisk)!=L_NO_NEXT_ELEMENT);