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We report the microwave spectrum of eight isotopologues of Ne\u00b7HCl, five of which have not previously been observed by high-resolution spectroscopy. We examine trends in experimentally derived van der Waals stretching force constants and effective bond lengths that are strongly sensitive to isotopologue-dependent motional averaging along the hindered rotation coordinate. Finally, we report an updated semi-empirical three-dimensional morphed potential for the Ne\u00b7HCl dimer that is fitted to a large dataset including previous microwave, near-IR, and sub-millimeter wave data in addition to our new microwave data.<\/jats:p>","DOI":"10.1063\/5.0308056","type":"journal-article","created":{"date-parts":[[2026,1,22]],"date-time":"2026-01-22T11:44:50Z","timestamp":1769082290000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Isotopologues of the NeHCl complex observed by chirped pulse Fourier transform microwave spectroscopy"],"prefix":"10.1063","volume":"164","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-5340-3310","authenticated-orcid":false,"given":"Muhammad Qasim","family":"Ali","sequence":"first","affiliation":[{"name":"Texas Tech University, Department of Chemistry and Biochemistry 1 , Lubbock, Texas 79409,","place":["USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8562-0046","authenticated-orcid":false,"given":"Arun","family":"Bhujel","sequence":"additional","affiliation":[{"name":"Texas Tech University, Department of Chemistry and Biochemistry 1 , Lubbock, Texas 79409,","place":["USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-0790-3819","authenticated-orcid":false,"given":"Salma","family":"Akter","sequence":"additional","affiliation":[{"name":"Texas Tech University, Department of Chemistry and Biochemistry 1 , Lubbock, Texas 79409,","place":["USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-6114-6533","authenticated-orcid":false,"given":"Surendra","family":"Sharma","sequence":"additional","affiliation":[{"name":"Texas Tech University, Department of Chemistry and Biochemistry 1 , Lubbock, Texas 79409,","place":["USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fan","family":"Xie","sequence":"additional","affiliation":[{"name":"Deutsches Elektronen-Synchrotron DESY 2 , Notkestr. 85, 22607 Hamburg,","place":["Germany"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7801-7134","authenticated-orcid":false,"given":"Melanie","family":"Schnell","sequence":"additional","affiliation":[{"name":"Deutsches Elektronen-Synchrotron DESY 2 , Notkestr. 85, 22607 Hamburg,","place":["Germany"]},{"name":"Institut f\u00fcr Physikalische Chemie, Christian-Albrechts-Universit\u00e4t zu Kiel 3 , 24118 Kiel,","place":["Germany"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2703-0846","authenticated-orcid":false,"given":"Luis A.","family":"Rivera-Rivera","sequence":"additional","affiliation":[{"name":"Ferris State University, Department of Physical Sciences 4 , Big Rapids, Michigan 49307,","place":["USA"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8716-220X","authenticated-orcid":false,"given":"G. 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