{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,21]],"date-time":"2025-10-21T15:46:26Z","timestamp":1761061586957,"version":"3.41.2"},"reference-count":21,"publisher":"AIP Publishing","issue":"2","funder":[{"DOI":"10.13039\/501100003716","name":"Korea Basic Science Institute","doi-asserted-by":"crossref","award":["140210"],"award-info":[{"award-number":["140210"]}],"id":[{"id":"10.13039\/501100003716","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2022,2,1]]},"abstract":"<jats:p>Fundamental obstacles toward the development of a portable time-of-flight mass spectrometer (TOF MS) are ionization sources and vacuum systems. To overcome these, a cold electron source (CES) and a pulse valve are introduced in this study to examine the possibility of developing a portable TOF MS. The CES is developed using a microchannel plate electron multiplier radiated by ultraviolet photons from a light-emitting diode. The CES is controlled using short pulses to generate accelerated electrons that ionize a substrate surface. A 10\u00a0ns CES pulse produces an electron flux density of 1013 to 1014\u00a0m\u22122 on the surface, and the short pulse minimizes the ionization time such that the resolution limit associated with a short drift tube is overcome. In addition, the injected 0.05\u00a0m3 quantitative sample reduces the vacuum exhaust load, and simultaneously, it is possible to temporarily form layers of the target molecules on the substrate. The possibility of immediate measurement by directly injecting benzene at ambient pressure was verified through repeated measurements; therefore, it is technically possible to use a CES to allow for a highly compact (and portable) TOF MS.<\/jats:p>","DOI":"10.1063\/5.0074883","type":"journal-article","created":{"date-parts":[[2022,2,4]],"date-time":"2022-02-04T13:28:43Z","timestamp":1643981323000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":2,"title":["Development of a portable time-of-flight mass spectrometer prototype using a cold electron source"],"prefix":"10.1063","volume":"93","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9511-8068","authenticated-orcid":false,"given":"Wanseop","family":"Jeong","sequence":"first","affiliation":[{"name":"Department of Physics, Chungbuk National University 1 , Cheongju 28644, Republic of Korea"},{"name":"Mass Spectrometry and Advanced Instrumentation Group, Korea Basic Science Institute 2 , Cheongju 28119, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4672-7710","authenticated-orcid":false,"given":"Hyun Sik","family":"Kim","sequence":"additional","affiliation":[{"name":"Mass Spectrometry and Advanced Instrumentation Group, Korea Basic Science Institute 2 , Cheongju 28119, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5491-8410","authenticated-orcid":false,"given":"Byeongwon","family":"Kang","sequence":"additional","affiliation":[{"name":"Department of Physics, Chungbuk National University 1 , Cheongju 28644, Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2022,2,4]]},"reference":[{"key":"2023081008371324800_c1","doi-asserted-by":"publisher","first-page":"339","DOI":"10.1016\/0020-7381(71)85013-1","volume":"6","year":"1971","journal-title":"Int. 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