Recent developments in atmospheric pressure photoionization‐mass spectrometry

Recent developments in atmospheric pressure photoionization (APPI), which is one of the three most important ionization techniques in liquid chromatography-mass spectrometry, are reviewed. The emphasis is on the practical aspects of APPI analysis, its combination with different separation techniques, novel instrumental developments - especially in gas chromatography and ambient mass spectrometry - and the applications that have appeared in 2009–2014. © 2015 Wiley Periodicals, Inc. Mass Spec Rev XX:1–27, 2015