The database developers appreciate valuable discussions and the review of Version 5.0 by Dr. Justin M. Gorham, Dr. John Henry Scott, and Adam G. Morey.

Many people have worked on this database, as indicated in the version history. NIST particularly wishes to acknowledge the contributions of the late Dr. Charles D. Wagner. Dr. Wagner, a pioneer in the development and application of X-ray photoelectron spectroscopy, perceived the need for the database and was solely responsible for compiling and evaluating the data in Version 1.0. These data are a major part of the present database.