CCL: Periodic System - semi empirical methods



Dear Friends,

I would like to know about the programmes that can handle periodic boundary
conditions using semi empirical methods.

I know MOPAC2009 could do that, but i find it difficult to find the documentation.
In this regards, could any one help me to find something similar if available for free.


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Regards,
Dr. Sanjay Bharathwaj Kumar,
Dharmendra Institute of Technology,
India.