{"id":3442,"date":"2022-10-18T01:50:58","date_gmt":"2022-10-18T06:50:58","guid":{"rendered":"https:\/\/kermitmurray.com\/msblog\/14690667221133388-2\/"},"modified":"2022-10-18T01:50:58","modified_gmt":"2022-10-18T06:50:58","slug":"14690667221133388-2","status":"publish","type":"post","link":"https:\/\/kermitmurray.com\/msblog\/14690667221133388-2\/","title":{"rendered":"Desorption of positive and negative ions from activated field emitters at atmospheric pressure"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/journals.sagepub.com\/na101\/home\/literatum\/publisher\/sage\/journals\/content\/emsa\/2023\/emsa_29_1\/emsa_29_1\/20230127-01\/emsa_29_1.cover.png\"><\/p>\n<h3>European Journal of Mass Spectrometry<\/h3>\n<p>SAGE Publications Ltd STM: European Journal of Mass Spectrometry: Table of Contents<br \/>\n<i><a href=\"https:\/\/journals.sagepub.com\/action\/showFeed?ui=0&#038;mi=ehikzz&#038;ai=2b4&#038;jc=emsa&#038;type=etoc&#038;feed=rss\">Table of Contents for European Journal of Mass Spectrometry. List of articles from both the latest and ahead of print issues.<\/a><\/i><\/p>\n<h4>Desorption of positive and negative ions from activated field emitters at atmospheric pressure<\/h4>\n<div>European Journal of Mass Spectrometry, <a href=\"https:\/\/journals.sagepub.com\/toc\/emsa\/29\/1\">Volume 29, Issue 1<\/a>, Page 21-32, February 2023. <br \/>Field desorption (FD) traditionally is an ionization technique in mass spectrometry (MS) that is performed in high vacuum. So far only two studies have explored FD at atmospheric pressure or even superatmospheric pressure, respectively. This work pursues ion desorption from 13-\u00b5m activated tungsten emitters at atmospheric pressure. The emitters are positioned in front of the atmospheric pressure interface of a Fourier transform-ion cyclotron resonance (FT-ICR) mass spectrometer and the entrance electrode of the interface is set to 3\u20135 kV with respect to the emitter. Under these conditions positive, and for the first time, negative ion desorption is achieved. In either polarity, atmospheric pressure field desorption (APFD) is robust and spectra are reproducible. Both singly charged positive and negative ions formed by these processes are characterized by accurate mass-based formula assignments and in part by tandem mass spectrometry. The compounds analyzed include the ionic liquids trihexyl(tetradecyl) phosphonium tris(pentafluoroethyl) trifluorophosphate) and 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, the acidic compounds perfluorononanoic acid and polyethylene glycol diacid, as well as two amino-terminated polypropylene glycols. Some surface mobility on the emitter is prerequisite for ion desorption to occur. While ionic liquids inherently provide this mobility, the desorption of ions from solid analytes requires the assistance of a liquid matrix, e.g. glycerol.<\/div>\n<p>J\u00fcrgen H. Gross<br \/>\n<b>October 18, 2022<\/b><br \/>\n<a href=\"https:\/\/journals.sagepub.com\/doi\/abs\/10.1177\/14690667221133388?ai=2b4&#038;mi=ehikzz&#038;af=R\">https:\/\/journals.sagepub.com\/doi\/abs\/10.1177\/14690667221133388?ai=2b4&#038;mi=ehikzz&#038;af=R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>European Journal of Mass Spectrometry SAGE Publications Ltd STM: European Journal of Mass Spectrometry: Table of Contents Table of Contents for European Journal of Mass Spectrometry. List of articles from both the latest and ahead of print issues. Desorption of positive and negative ions from activated field emitters at atmospheric pressure European Journal of Mass &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/kermitmurray.com\/msblog\/14690667221133388-2\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Desorption of positive and negative ions from activated field emitters at atmospheric pressure&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[22],"tags":[57,49],"class_list":["post-3442","post","type-post","status-publish","format-standard","hentry","category-web-2","tag-ejms","tag-rss","entry"],"_links":{"self":[{"href":"https:\/\/kermitmurray.com\/msblog\/wp-json\/wp\/v2\/posts\/3442","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kermitmurray.com\/msblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kermitmurray.com\/msblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kermitmurray.com\/msblog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/kermitmurray.com\/msblog\/wp-json\/wp\/v2\/comments?post=3442"}],"version-history":[{"count":0,"href":"https:\/\/kermitmurray.com\/msblog\/wp-json\/wp\/v2\/posts\/3442\/revisions"}],"wp:attachment":[{"href":"https:\/\/kermitmurray.com\/msblog\/wp-json\/wp\/v2\/media?parent=3442"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kermitmurray.com\/msblog\/wp-json\/wp\/v2\/categories?post=3442"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kermitmurray.com\/msblog\/wp-json\/wp\/v2\/tags?post=3442"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}