The Contents Awareness service allows anyone who registers their e-mail address to be notified via e-mail when new content goes online. You may choose to receive any or all of the following: Notification that a new issue of APS Journals is online. Complete table of contents (eTOC) for new issues. Special announcements from APS. Contents Awareness is a free service: sign up now! About CiteTrack CiteTrack will alert you by email whenever new content in the APS Journals or a participating journal is published that matches criteria based on the topics, authors and articles you want to track: Topics - Tell CiteTrack which words or subjects to watch for in new content. Authors - Be alerted whenever key authors you are following publish a new paper. Articles - Know whenever a paper of interest to you is referenced by another paper or letter. Read more information about CiteTrack. CiteTrack is a free service: sign up now!