Hi every one

I use forcite tools to model collision between two molecules.And my procedures are

(1)Firstly, I do geometry optimization using Dreiding forcefield.

(2)Then I perform a dynamics using Dreiding forcefield at desired temperature with Berendsen.

(3)Finally I apply a velocity to one of the molecules,and the forcefield is Dreiding,too.

I have achieved  the goal in forcite through the procedures mentioned above.And I also want to achieve the goal using PM3 method  in VAMP.But, I find VAMP set up dialogs include geometry optimization option,but it does not include dynamics option,so I can not carry on  rest of procedures.

My quetion are：

(1)Could it be possible to use PM3 method provided in VAMP instead of Dreiding forcefiled to model the potential energy of two molecules in forcite?

(2)Or can I perform collision task mentioned above in VAMP with PM3?

Thanks for reading this post.And look forward to your reply.

Thanks

Li