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Dynamical electron correlation is treated at the coupled-cluster with single and double excitations and a perturbative estimate of triple excitations level, with basis-set extrapolation. Spin\u2013orbit coupling is treated by configuration interaction in a basis of multireference configuration interaction states. The results compare favorably with available experimental data, especially for low-lying electronic states. For the yet-unobserved first excited state, \u03a9 = 1\/2, we predict constants including Te = (2036 \u00b1 300) cm\u22121 and \u0394G1\/2 = (2252.5 \u00b1 8) cm\u22121. Temperature-dependent thermodynamic functions, and thermochemistry of dissociation, are computed from the spectroscopic data. The ideal-gas enthalpy of formation is \u0394fH298.15o(PtH) = (449.1 \u00b1 4.5) kJ mol\u22121 (uncertainties expanded by k = 2). The experimental data are reinterpreted, using a somewhat speculative procedure, to yield the bond length Re = (1.5199 \u00b1 0.0006) \u00c5.<\/jats:p>","DOI":"10.1063\/5.0145567","type":"journal-article","created":{"date-parts":[[2023,5,5]],"date-time":"2023-05-05T10:25:40Z","timestamp":1683282340000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":2,"title":["<i>Ab initio<\/i> spectroscopy and thermochemistry of diatomic platinum hydride, PtH"],"prefix":"10.1063","volume":"158","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7515-6761","authenticated-orcid":false,"given":"Karl K.","family":"Irikura","sequence":"first","affiliation":[{"name":"Chemical Sciences Division, National Institute of Standards and Technology , Gaithersburg, Maryland 20899, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"317","published-online":{"date-parts":[[2023,5,5]]},"reference":[{"key":"2023081105321307900_c1","doi-asserted-by":"publisher","first-page":"93","DOI":"10.3390\/resources10090093","volume":"10","year":"2021","journal-title":"Resources"},{"key":"2023081105321307900_c2","doi-asserted-by":"publisher","first-page":"4235","DOI":"10.1021\/ja003576x","volume":"123","year":"2001","journal-title":"J. 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