1 23 International Journal for Ion Mobility Spectrometry ISSN 1435-6163 Volume 18 Combined 1-2 Int. J. Ion Mobil. Spec. (2015) 18:67-75 DOI 10.1007/s12127-014-0162-8 Effect of the humidity on analysis of aromatic compounds with planar differential ion mobility spectrometry Andriy Kuklya, Florian Uteschil, Klaus Kerpen, Robert Marks & Ursula Telgheder