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The linewidths (FWHM) were found to increase with increasing vibrational energy and range from 0.002\u2005cm<jats:sup>\u22121<\/jats:sup> in the <jats:italic>v<\/jats:italic><jats:sub>3<\/jats:sub> band (C\u2212F stretch) at ~1047\u2005cm<jats:sup>\u22121<\/jats:sup>, to 0.65\u2005cm<jats:sup>\u22121<\/jats:sup> in the <jats:italic>v<\/jats:italic><jats:sub>4<\/jats:sub> band (asymmetric C\u2212H stretch) at ~2997\u2005cm<jats:sup>\u22121<\/jats:sup>. In between these two bands we observed the lower and upper components of the Fermi triad bands (\u03bd<jats:sub>1<\/jats:sub>\/2\u03bd<jats:sub>2<\/jats:sub>\/2\u03bd<jats:sub>5<\/jats:sub>) at ~2859 and ~2961\u2005cm<jats:sup>\u22121<\/jats:sup>. We carried out Stark spectroscopy on the lower band on account of its narrower linewidths (0.04 vs. 0.14\u2005cm<jats:sup>\u22121<\/jats:sup>, respectively). The objective of performing Stark spectroscopy was to see if there is any evidence for a rotational linewidth dependence on the external field strength, due to a reduced difference in between methyl fluorides rotational energy gap and the roton\u2010gap of superfluid helium. We did not find any evidence for such an effect, which we largely attribute to the rotational energy gap not increasing significantly enough by the external field. We point to another molecule (formaldehyde) whose energy levels are predicted to show a more promising response to application of an external field.<\/jats:p>","DOI":"10.1002\/cphc.202400224","type":"journal-article","created":{"date-parts":[[2024,3,21]],"date-time":"2024-03-21T04:09:55Z","timestamp":1710994195000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Infrared Laser Stark Spectroscopy of Methyl Fluoride in <sup>4<\/sup>He Nanodroplets"],"prefix":"10.1002","volume":"25","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3717-4154","authenticated-orcid":false,"given":"Paul L.","family":"Raston","sequence":"first","affiliation":[{"name":"Department of Chemistry University of Hawai\u2018i at M\u0101noa  Honolulu HI 96822 United States"},{"name":"Department of Chemistry and Biochemistry James Madison University  Harrisonburg VA 22807 United States"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6530-7466","authenticated-orcid":false,"given":"Gary E.","family":"Douberly","sequence":"additional","affiliation":[{"name":"Department of Chemistry University of Georgia  Athens GA 30602 United States"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2024,4,16]]},"reference":[{"key":"e_1_2_9_1_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.75.1566"},{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/BF01437187"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.76.4560"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevB.103.104516"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.279.5359.2083"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.2822041"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1016\/0009-2614(95)00167-3"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1080\/002689799163497"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1080\/01442350600625092"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.1319965"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.481011"},{"key":"e_1_2_9_12_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.1412257"},{"key":"e_1_2_9_13_1","doi-asserted-by":"publisher","DOI":"10.1039\/c1cp21348b"},{"key":"e_1_2_9_14_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.5009908"},{"key":"e_1_2_9_15_1","doi-asserted-by":"publisher","DOI":"10.1063\/5.0010716"},{"key":"e_1_2_9_16_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jms.2022.111676"},{"key":"e_1_2_9_17_1","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.physchem.49.1.1"},{"key":"e_1_2_9_18_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.1418746"},{"key":"e_1_2_9_19_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.200300611"},{"key":"e_1_2_9_20_1","doi-asserted-by":"publisher","DOI":"10.1088\/0953-4075\/39\/8\/R01"},{"key":"e_1_2_9_21_1","doi-asserted-by":"publisher","DOI":"10.1080\/01442350601087664"},{"key":"e_1_2_9_22_1","doi-asserted-by":"publisher","DOI":"10.1080\/01442350801933485"},{"key":"e_1_2_9_23_1","doi-asserted-by":"publisher","DOI":"10.1039\/C2CS35277J"},{"key":"e_1_2_9_24_1","doi-asserted-by":"publisher","DOI":"10.1080\/23746149.2018.1553569"},{"key":"e_1_2_9_25_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-030-94896-2_4"},{"key":"e_1_2_9_26_1","doi-asserted-by":"publisher","DOI":"10.1039\/D1CP04368D"},{"key":"e_1_2_9_27_1","unstructured":"E. 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