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Oxidation products were characterized using ion mobility spectrometry (IMS) and tandem IMS\u2013mass spectrometry (IMS-MS) with an internal corona-discharge APCI source. This configuration enables structural isomer resolution and provides deeper insight into the molecular composition of the oxidation products. IMS-MS analysis showed that alkane (M) oxidation produces mainly ketones ([M+O\u20132H]) and diketones ([M+2O\u20134H]), with 3-ketone isomers dominating. Under standard APCI conditions, H+(H2O)n reactant ions protonated these products, generating complex IMS spectra for [M+O-2H].H+ and [M+2O-4H].H+. Introducing NH3 as a dopant shifted the primary reactant ion to NH4+(H2O)n, forming [M+O\u20132H]. NH4+ and [M+2O\u20134H].NH4+ adducts with similar collision cross sections. This simplified the IMS spectra to a single peak, enhanced sensitivity, and improved suitability for analytical applications. Using this approach, quantitative analysis of selected alkanes yielded detection limits of 0.01\u20130.1 ppmv.<\/jats:p>","DOI":"10.1021\/jasms.6c00175","type":"journal-article","created":{"date-parts":[[2026,7,1]],"date-time":"2026-07-01T06:31:21Z","timestamp":1782887481000},"page":"1990-2002","source":"Crossref","is-referenced-by-count":0,"title":["Characterization of\nAlkane Oxidation Products in a\nCorona-Discharge Reactor Using Ammonia-Doped Ion Mobility\u2013Mass\nSpectrometry"],"prefix":"10.1021","volume":"37","author":[{"given":"Priyanka","family":"Kumari","sequence":"first","affiliation":[{"name":"Comenius University , , Mlynska\u0301 dolina F2 , ,","place":["Bratislava, Slovakia, 84248"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Younes","family":"Valadbeigi","sequence":"additional","affiliation":[{"name":"Imam Khomeini International University , , ,","place":["Qazvin, Iran, 34148-96818"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vahideh","family":"Ilbeigi","sequence":"additional","affiliation":[{"name":"Comenius University , , Mlynska\u0301 dolina F2 , ,","place":["Bratislava, Slovakia, 84248"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7238-5964","authenticated-orcid":true,"given":"S\u030ctefan","family":"Matejc\u030ci\u0301k","sequence":"additional","affiliation":[{"name":"Comenius University , , Mlynska\u0301 dolina F2 , ,","place":["Bratislava, Slovakia, 84248"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,7,1]]},"reference":[{"key":"2026080510100072300_cit1","doi-asserted-by":"crossref","first-page":"69","DOI":"10.1016\/B978-0-08-022059-8.50010-8","article-title":"Natural background\nof alkanes in the aquatic environment","volume-title":"Aquatic Pollutants: Transformation and Biological Effects","author":"Brassell","year":"1978"},{"key":"2026080510100072300_cit2","doi-asserted-by":"publisher","DOI":"10.1016\/j.combustflame.2024.113898","article-title":"Synchrotron vacuum ultraviolet photoionization mass\nspectrometry to examine low temperature oxidation chemistry of n-heptane\nunder different fuel concentrations and pressures","volume":"272","author":"Chen","year":"2025","journal-title":"Combust. 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