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The I3\u03a3\u2212 \u2212 X3\u03a3\u2212 transition system containing 16 vibronic bands was identified in the LIF spectra, covering the energy range of 22\u2009030\u201323\u2009400\u00a0cm\u22121. The spectra with rotational resolution allowed for the determination of the molecular constants in both the ground X and excited I electronic states, involving the spin\u2013orbit splitting, rotational constant, vibrational frequency, and isotope shift. Isotopically resolved SVL emission spectra permitted the observation of the spin\u2013orbit splitting, vibrational frequency, and vibrational isotope shift of the X3\u03a3\u22120+,1 and A3\u03a02,1,0\u2212,0+ states as they transitioned from the excited I state to the vibrational levels of the X and A states. Ab initio calculations presented plenty of the \u039b-S and \u03a9 states of PdS below 28\u2009000\u00a0cm\u22121 and provided strong support for the assignments of the experimental observation.<\/jats:p>","DOI":"10.1063\/5.0179596","type":"journal-article","created":{"date-parts":[[2023,11,27]],"date-time":"2023-11-27T15:10:07Z","timestamp":1701097807000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":1,"title":["Optical spectroscopy of the previously unobserved palladium monosulfide (PdS) radical"],"prefix":"10.1063","volume":"159","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-7484-9697","authenticated-orcid":false,"given":"Lei","family":"Zhang","sequence":"first","affiliation":[{"name":"School of Mathematics and Physics, Lanzhou Jiaotong University 1 , Lanzhou 730070, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0747-2428","authenticated-orcid":false,"given":"Wenli","family":"Zou","sequence":"additional","affiliation":[{"name":"Institute of Modern Physics, Northwest University 2 , Xi\u2019an 710127, Shaanxi, China"},{"name":"Shaanxi Key Laboratory for Theoretical Physics Frontiers 3 , Xi\u2019an 710127, Shaanxi, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-8818-9548","authenticated-orcid":false,"given":"Yao","family":"Yu","sequence":"additional","affiliation":[{"name":"Institute of Modern Physics, Chinese Academy of Sciences 4 , Lanzhou 730000, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9221-6228","authenticated-orcid":false,"given":"Jie","family":"Yang","sequence":"additional","affiliation":[{"name":"Institute of Modern Physics, Chinese Academy of Sciences 4 , Lanzhou 730000, China"},{"name":"CAS Key Laboratory of High Precision Nuclear Spectroscopy, Institute of Modern Physics, Chinese Academy of Sciences 5 , Lanzhou 73000, China"},{"name":"Advanced Energy Science and Technology Guangdong Laboratory 6 , Huizhou 516003, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2023,11,27]]},"reference":[{"key":"2023112715064027300_c1","doi-asserted-by":"publisher","first-page":"2100097","DOI":"10.1002\/smsc.202100097","volume":"2","year":"2022","journal-title":"Small Sci."},{"key":"2023112715064027300_c2","doi-asserted-by":"publisher","first-page":"151","DOI":"10.1016\/j.jcat.2012.03.008","volume":"290","year":"2012","journal-title":"J. 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