{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,9]],"date-time":"2025-11-09T07:38:21Z","timestamp":1762673901719,"version":"3.41.2"},"reference-count":64,"publisher":"AIP Publishing","issue":"17","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2012,11,7]]},"abstract":"<jats:p>High resolution microwave spectra of the a-type, J = 1\u20130, transitions of HeN = 1\u20136\u2013H12C14N, HeN = 1\u20136\u2013H13C14N, HeN = 1\u20136\u2013H12C15N, HeN = 1\u20137\u2013D12C14N, and HeN = 1\u20136\u2013D13C14N clusters produced in a supersonic jet expansion were measured and analyzed. The resulting effective rotational constants, Beff, initially decrease with the number of the attached helium atoms before reaching a minimum at N = 3 helium atoms for all isotopologues. The subsequent increase in Beff for N \u2265 4 is indicative of the onset of microscopic superfluidity. Comparison of our experimental Beff constants with those from quantum Monte Carlo simulations [A. A. Mikosz, J. A. Ramilowski, and D. Farrelly, J. Chem. Phys.\u2008125, 014312 (2006)10.1063\/1.2213253] reveals a nearly congruent trend in Beff for N up to 6. Analysis of the hyperfine structure of the 14N containing isotopologues yielded a gradual incremental increase in the magnitude of \u03c7aa and \u27e8P2(cos\u2009\u03b8)\u27e9 for N = 1\u20136, which suggests the internal rotation of the HCN molecule is becoming increasingly hindered.<\/jats:p>","DOI":"10.1063\/1.4762862","type":"journal-article","created":{"date-parts":[[2012,11,6]],"date-time":"2012-11-06T00:33:45Z","timestamp":1352162025000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":41,"title":["Rotational spectroscopic study of hydrogen cyanide embedded in small 4He clusters"],"prefix":"10.1063","volume":"137","author":[{"given":"Steve P.","family":"Dempster","sequence":"first","affiliation":[{"name":"University of Alberta, Edmonton Department of Chemistry, , Alberta T6G 2G2, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Oleksandr","family":"Sukhorukov","sequence":"additional","affiliation":[{"name":"University of Alberta, Edmonton Department of Chemistry, , Alberta T6G 2G2, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qi-Yi","family":"Lei","sequence":"additional","affiliation":[{"name":"University of Alberta, Edmonton Department of Chemistry, , Alberta T6G 2G2, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wolfgang","family":"J\u00e4ger","sequence":"additional","affiliation":[{"name":"University of Alberta, Edmonton Department of Chemistry, , Alberta T6G 2G2, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2012,11,5]]},"reference":[{"key":"2023062607370857600_c1","doi-asserted-by":"publisher","first-page":"2083","DOI":"10.1126\/science.279.5359.2083","volume":"279","year":"1998","journal-title":"Science"},{"issue":"31","key":"2023062607370857600_c2a","doi-asserted-by":"publisher","first-page":"7329","DOI":"10.1021\/jp070618w","volume":"111","year":"2007","journal-title":"J. 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