{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,20]],"date-time":"2026-01-20T08:20:58Z","timestamp":1768897258691,"version":"3.49.0"},"reference-count":133,"publisher":"AIP Publishing","issue":"8","content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2018,2,28]]},"abstract":"<jats:p>Three dihalogenated methane derivatives (CH2F2, CH2FCl, and CH2Cl2) were used as model systems to compare and assess the accuracy of two different approaches for predicting observed fundamental frequencies: canonical operator Van Vleck vibrational perturbation theory (CVPT) and vibrational configuration interaction (VCI). For convenience and consistency, both methods employ the Watson Hamiltonian in rectilinear normal coordinates, expanding the potential energy surface (PES) as a Taylor series about equilibrium and constructing the wavefunction from a harmonic oscillator product basis. At the highest levels of theory considered here, fourth-order CVPT and VCI in a harmonic oscillator basis with up to 10 quanta of vibrational excitation in conjunction with a 4-mode representation sextic force field (SFF-4MR) computed at MP2\/cc-pVTZ with replacement CCSD(T)\/aug-cc-pVQZ harmonic force constants, the agreement between computed fundamentals is closer to 0.3 cm\u22121 on average, with a maximum difference of 1.7 cm\u22121. The major remaining accuracy-limiting factors are the accuracy of the underlying electronic structure model, followed by the incompleteness of the PES expansion. Nonetheless, computed and experimental fundamentals agree to within 5 cm\u22121, with an average difference of 2 cm\u22121, confirming the utility and accuracy of both theoretical models. One exception to this rule is the formally IR-inactive but weakly allowed through Coriolis-coupling H\u2013C\u2013H out-of-plane twisting mode of dichloromethane, whose spectrum we therefore revisit and reassign. We also investigate convergence with respect to order of CVPT, VCI excitation level, and order of PES expansion, concluding that premature truncation substantially decreases accuracy, although VCI(6)\/SFF-4MR results are still of acceptable accuracy, and some error cancellation is observed with CVPT2 using a quartic force field.<\/jats:p>","DOI":"10.1063\/1.5020295","type":"journal-article","created":{"date-parts":[[2018,2,22]],"date-time":"2018-02-22T17:37:15Z","timestamp":1519321035000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":21,"title":["Comparing the accuracy of perturbative and variational calculations for predicting fundamental vibrational frequencies of dihalomethanes"],"prefix":"10.1063","volume":"148","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2562-500X","authenticated-orcid":false,"given":"Sergey V.","family":"Krasnoshchekov","sequence":"first","affiliation":[{"name":"Department of Chemistry, Lomonosov Moscow State University 1 , Leninskiye Gory 1-3, Moscow 119991, Russian Federation"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1654-3336","authenticated-orcid":false,"given":"Roman S.","family":"Schutski","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Rice University 2 , Houston, Texas 77005, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2864-1910","authenticated-orcid":false,"given":"Norman C.","family":"Craig","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry, Oberlin College 3 , Oberlin, Ohio 44074, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7623-4992","authenticated-orcid":false,"given":"Marat","family":"Sibaev","sequence":"additional","affiliation":[{"name":"Research School of Chemistry, Australian National University 4 , Canberra, ACT 2601, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Deborah L.","family":"Crittenden","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Canterbury 5 , Christchurch 8140, New Zealand"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2018,2,22]]},"reference":[{"key":"2023062608002390400_c1","doi-asserted-by":"publisher","first-page":"83","DOI":"10.1016\/0022-2852(92)90031-i","article-title":"High-resolution FTIR study of the \u03bd4 band of CH2F2","volume":"154","year":"1992","journal-title":"J. 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