Dear CCLers, Does anyone know of programs or subroutines that calculate the two-particle density matrix, rho(r1,r2), from Gaussian wavefunction WFN file ? Any help will be appreciated Thanks a lot -- Nguyen Nam Anh Quebec, Canada E-mail: anh { *at * } chm.ulaval.ca WWW: http://promethium.chm.ulaval.ca/~anh/