CCL:G: Gaussian03 and Periodic Bondary Condition

 Sent to CCL by: "Young  Leh" [youngleh-]
 Dear CCLer,
 > From the Gaussian website, it looks like Gaussian03 is able to perform
 periodic caculations.  But I can not find further explanation on how to achieve
 this.  I need some information like how to specify the input and what the
 keyword(s) are?
 Could somebody please help?
 Young Leh