title: Mechanism of ultraviolet bonding of perfluoropolyethers revisited.
abstract: The mechanism of ultraviolet (UV) bonding of perfluoropolyether (PFPE) boundary lubricants on magnetic disk surfaces is re-examined experimentally. It is found that UV-emitted photoelectrons may contribute a negligible part, and instead the UV bonding correlates with the direct photodissociation of PFPE molecules. The UV-induced photodissociation is demonstrated to occur almost randomly on the PFPE molecular chain. The contribution from photooxidation is eliminated under nitrogen purge.
authors.affiliation: San Jose Research Center, Hitachi Global Storage Technologies, Inc., 3403 Yerba Buena Road, San Jose, California 95135, USA. Xing-Cai.Guo@HitachiGST.com
authors.forename: Xing-Cai
authors.initials: XC
authors.lastname: Guo
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Waltman