{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T10:14:26Z","timestamp":1784024066855,"version":"3.55.0"},"reference-count":55,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2021,12,27]],"date-time":"2021-12-27T00:00:00Z","timestamp":1640563200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000001","name":"National Science Foundation","doi-asserted-by":"publisher","award":["1555781"],"award-info":[{"award-number":["1555781"]}],"id":[{"id":"10.13039\/100000001","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Symmetry"],"abstract":"<jats:p>We demonstrate for the first time high-precision differential microwave spectroscopy, achieving sub-Hz precision by coupling a cryogenic buffer gas cell with a tunable microwave Fabry\u2013Perot cavity. We report statistically limited sub-Hz precision of (0.08 \u00b1 0.72) Hz, observed between enantiopure samples of (R)-1,2-propanediol and (S)-1,2-propanediol at frequencies near 15 GHz. We confirm highly repeatable spectroscopic measurements compared to traditional pulsed-jet methods, opening up new capabilities in probing subtle molecular structural effects at the 10\u221210 level and providing a platform for exploring sources of systematic error in parity-violation searches. We discuss dominant systematic effects at this level and propose possible extensions of the technique for higher precision.<\/jats:p>","DOI":"10.3390\/sym14010028","type":"journal-article","created":{"date-parts":[[2021,12,27]],"date-time":"2021-12-27T01:03:37Z","timestamp":1640567017000},"page":"28","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Sub-Hz Differential Rotational Spectroscopy of Enantiomers"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1094-1990","authenticated-orcid":false,"given":"Lincoln","family":"Satterthwaite","sequence":"first","affiliation":[{"name":"Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA 93106, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0036-4309","authenticated-orcid":false,"given":"Greta","family":"Koumarianou","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA 93106, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5102-6150","authenticated-orcid":false,"given":"Daniel","family":"Sorensen","sequence":"additional","affiliation":[{"name":"Physics Department, University of California Santa Barbara, Santa Barbara, CA 93106, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David","family":"Patterson","sequence":"additional","affiliation":[{"name":"Physics Department, University of California Santa Barbara, Santa Barbara, CA 93106, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2021,12,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1230015","DOI":"10.1142\/S0217751X12300153","article-title":"Searching for new physics beyond the standard model in electric dipole moment","volume":"27","author":"Fukuyama","year":"2012","journal-title":"Int. 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