CCL:G: clarification -input methods to study the dispersion interactions

 Sent to CCL by: "KARTHICK Neelamegam Kannan"
    I am a research scholar working on Chemical Physics. I use Density
 Functional Theory to study the weak molecular interactions. I am using
 Gaussian09W program for simulating the molecular complexes. Can you please
 provide me information regarding the identification of dispersion
 interactions in optimized molecular complexes? Moreover please help me by
 providing the input methods or keywords in Gaussian programme which is
 required for studying the dispersion interactions. Because one of my papers
 got rejected recently, in which i had employed B3LYP methods . The reviewer
 commented me that B3LYP method is not appropriate to study the dispersion
 interactions. So Kindly help me on how to study the dispersion interactions
 in molecular complexes using Gaussian programme.
 N. K. Karthick
 Research Scholar
 Department of Physics
 Thiagarajar College
 e mail id  nkkarthick1021 at gmail dot com