Below are a mix of encyclopedias and series of review articles covering physical chemistry topics. Please note the publication year of the article, in the event it is out of date and you need to find something more recent.
Comprehensive chemical encyclopedia covering all aspects of chemistry and chemical engineering. Good complement to Ullmann's. [Adds/updates articles quarterly]
Comprehensive chemical encyclopedia covering all aspects of chemistry and chemical engineering. Good complement to Kirk-Othmer. [Adds/updates articles quarterly]
Covers fundamentals, technology and applications of atomic, electronic, high energy, magnetic, mass, vibrational and raman spectroscopy. [3rd ed., 2017]