- Welcome to the Institute of Theoretical Chemistry NSR institute, University of Nijmegen Toernooiveld 1, 6525 ED Nijmegen, The Netherlands Tel. : +31-24-3653036, Fax: +31-24-3653041 Staff Prof. dr. ir. Ad van der Avoird (N2060, tel. 53037) Mw. E.A.M.L. (Ine) Meijer (secretary) (N2062, tel. 53036) Dr. ir. Paul E.S. Wormer (N2056, tel. 53039) Dr. ir. Gerrit C. Groenenboom (N2031, tel. 53034) ...www.theochem.kun.nl