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===Contactless atmospheric pressure ionization=== Contactless atmospheric pressure ionization is a technique used for analysis of liquid and solid samples by mass spectrometry.<ref name="HsiehChang2011">{{cite journal|last1=Hsieh|first1=Cheng-Huan|last2=Chang|first2=Chia-Hsien|last3=Urban|first3=Pawel L.|last4=Chen|first4=Yu-Chie|title=Capillary Action-Supported Contactless Atmospheric Pressure Ionization for the Combined Sampling and Mass Spectrometric Analysis of Biomolecules|journal=Analytical Chemistry|volume=83|issue=8|date=2011|pages=2866β2869|issn=0003-2700|doi=10.1021/ac200479s|pmid=21446703}}</ref> Contactless API can be operated without an additional electric power supply (supplying voltage to the source emitter), gas supply, or [[syringe pump]]. Thus, the technique provides a facile means for analyzing chemical compounds by mass spectrometry at atmospheric pressure.
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