TY - RPRT TI - Minimum proton affinity for efficient ionization with atmospheric pressure desorption/ionization on silicon mass spectrometry. AU - Pekka Ostman AU - Jaana M H Pakarinen AU - Pirjo Vainiotalo AU - Sami Franssila AU - Risto Kostiainen AU - Tapio Kotiaho PY - 2006 DO - 10.1002/rcm.2785 UR - https://pubmed.ncbi.nlm.nih.gov/17115377/ ID - 17115377 ER -