{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,18]],"date-time":"2025-12-18T09:28:27Z","timestamp":1766050107113,"version":"3.41.2"},"reference-count":50,"publisher":"AIP Publishing","issue":"11","license":[{"start":{"date-parts":[[2023,9,21]],"date-time":"2023-09-21T00:00:00Z","timestamp":1695254400000},"content-version":"am","delay-in-days":365,"URL":"https:\/\/publishing.aip.org\/authors\/rights-and-permissions"}],"funder":[{"DOI":"10.13039\/100000015","name":"U.S. Department of Energy","doi-asserted-by":"publisher","award":["DE-SC0021227","AL-20-380-066"],"award-info":[{"award-number":["DE-SC0021227","AL-20-380-066"]}],"id":[{"id":"10.13039\/100000015","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["pubs.aip.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2022,9,21]]},"abstract":"<jats:p>The precise ionization energy of praseodymium oxide (PrO) seeded in supersonic molecular beams is measured with mass-analyzed threshold ionization (MATI) spectroscopy. A total of 33 spin\u2013orbit (SO) states of PrO and 23 SO states of PrO+ are predicted by second-order multiconfigurational quasi-degenerate perturbation (MCQDPT2) theory. Electronic transitions from four low-energy SO levels of the neutral molecule to the ground state of the singly charged cation are identified by combining the MATI spectroscopic measurements with the MCQDPT2 calculations. The precise ionization energy is used to reassess the ionization energies and the reaction enthalpies of the Pr\u00a0+ O \u2192 PrO+ + e\u2212 chemi-ionization reaction reported in the literature. An empirical formula that uses atomic electronic parameters is proposed to predict the ionization energies of lanthanide monoxides, and the empirical calculations match well with available precise experimental measurements.<\/jats:p>","DOI":"10.1063\/5.0113741","type":"journal-article","created":{"date-parts":[[2022,8,30]],"date-time":"2022-08-30T18:14:48Z","timestamp":1661883288000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":8,"title":["Electronic states and transitions of PrO and PrO+ probed by threshold ionization spectroscopy and spin\u2013orbit multiconfiguration perturbation theory"],"prefix":"10.1063","volume":"157","author":[{"given":"Yuchen","family":"Zhang","sequence":"first","affiliation":[{"name":"Department of Chemistry, University of Kentucky 1 , Lexington, Kentucky 40506-0055, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7301-9752","authenticated-orcid":false,"given":"Taiji","family":"Nakamura","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Ames National Laboratory, Iowa State University 2 , Ames, Iowa 50011-3111, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lu","family":"Wu","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Kentucky 1 , Lexington, Kentucky 40506-0055, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2852-4047","authenticated-orcid":false,"given":"Wenjin","family":"Cao","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Kentucky 1 , Lexington, Kentucky 40506-0055, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8624-5217","authenticated-orcid":false,"given":"George","family":"Schoendorff","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Ames National Laboratory, Iowa State University 2 , Ames, Iowa 50011-3111, USA"},{"name":"Propellants Branch, Rocket Propulsion Division, Aerospace Systems Directorate, Air Force Research Laboratory, AFRL\/RQRP 3 , Edwards Air Force Base, California 93524, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2371-1318","authenticated-orcid":false,"given":"Mark S.","family":"Gordon","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Ames National Laboratory, Iowa State University 2 , Ames, Iowa 50011-3111, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9842-4343","authenticated-orcid":false,"given":"Dong-Sheng","family":"Yang","sequence":"additional","affiliation":[{"name":"Department of Chemistry, University of Kentucky 1 , Lexington, Kentucky 40506-0055, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2022,9,21]]},"reference":[{"key":"2023092100013047400_c1","doi-asserted-by":"publisher","first-page":"4542","DOI":"10.1021\/cr5003479","volume":"115","year":"2015","journal-title":"Chem. 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