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[liuyudong97@mails.tsinghua.edu.cn]

Dear All:
thank friends for answering my previous quesiton.
Now, I have a related question: 

How to get the superimpositioned charge density of two atoms that form a 
chemical bond just from a single calcualtion?

My intention is to calcualte the bond charge___ n(b), it is as:
       n(b)=n(t)-[nA+nB]
   
 where  n(t) is just the total charge density from Cut3d analysis;
        nA and nB is respectively the original charge density of isolated 
         atom A or B. 
Now,
1) As suggested by friends, one way is just to calculate the charge density 
of each atom, then sums them together to get [nA+nB]___ superpositioned 
charge density.  Finally substrat it from n(t) to get n(b). This is just done 
by me.
But, a better methods exists if the following problem is solved: 
2) is there any superpsotioned charge density value which has been included 
in the SCF steps. If YES, HOW to GET IT?

thank you