Visible light induced paramagnetic sites in nitrogen-doped TiO 2 prepared by a mechanochemical method Yamamoto, Y. ; Moribe, S. ; Ikoma, T. ; Akiyama, K. ; Zhang, Q. ; Saito, F. ; Tero-Kubota, S. Abstract Publication: Molecular Physics Pub Date: May 2006 DOI: 10.1080/00268970600551387 Bibcode: 2006MolPh.104.1733Y