{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,25]],"date-time":"2026-02-25T00:36:31Z","timestamp":1771979791921,"version":"3.50.1"},"reference-count":0,"publisher":"Canadian Science Publishing","issue":"7-8","license":[{"start":{"date-parts":[[1995,7,1]],"date-time":"1995-07-01T00:00:00Z","timestamp":804556800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/www.nrcresearchpress.com\/page\/about\/CorporateTextAndDataMining"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Can. J. Phys."],"published-print":{"date-parts":[[1995,7,1]]},"abstract":"<jats:p> The hyperfine and isotope shifts of the (6s)<jats:sup>2<\/jats:sup><jats:sup>1<\/jats:sup>S<jats:sub>0<\/jats:sub>\u2002\u2192\u2002(6s6p) <jats:sup>1<\/jats:sup>P<jats:sub>1<\/jats:sub> transition in barium were measured using a ring dye laser to excite an atomic beam. The laser frequency was scanned across the transition while fluorescence produced by the radiative decay of the excited state was detected. The frequency was calibrated using an acousto-optic modulator to frequency shift part of the laser beam. The spectrum therefore consisted of pairs of peaks separated by the modulation frequency. The shifts (MHz) relative to <jats:sup>138<\/jats:sup>Ba are <jats:sup>137<\/jats:sup>Ba F\u2002=\u20025\/2, 63.43\u2002\u00b1\u20020.25; <jats:sup>135<\/jats:sup>Ba F\u2002=\u20025\/2, 120.55\u2002\u00b1\u20020.25; <jats:sup>136<\/jats:sup>Ba, 128.02\u2002\u00b1\u20020.39; <jats:sup>137<\/jats:sup>Ba F\u2002=\u20023\/2, 274.56\u2002\u00b1\u20020.09; <jats:sup>135<\/jats:sup>Ba, 323.44\u2002\u00b1\u20020.19; and <jats:sup>135,137<\/jats:sup>Ba F\u2002=\u20021\/2, 549.47\u2002\u00b1\u20020.12 where the transition in <jats:sup>138<\/jats:sup>Ba occurs at the lower frequency. The magnetic dipole a and electric quadrupole b hyperfine coupling constants (MHz) of the (6s6p) <jats:sup>1<\/jats:sup>P<jats:sub>1<\/jats:sub> state were determined to be a<jats:sub>135<\/jats:sub>\u2002=\u2002\u221298.16\u2002\u00b1\u20020.14, b<jats:sub>135<\/jats:sub>\u2002=\u200234.01\u2002\u00b1\u20020.22, a<jats:sub>137<\/jats:sub>\u2002=\u2002\u2212109.50\u2002\u00b1\u20020.13, and b<jats:sub>137<\/jats:sub>\u2002=\u200250.09\u2002\u00b1\u20020.21. <\/jats:p>","DOI":"10.1139\/p95-069","type":"journal-article","created":{"date-parts":[[2011,4,24]],"date-time":"2011-04-24T07:57:45Z","timestamp":1303631865000},"page":"484-488","source":"Crossref","is-referenced-by-count":14,"title":["Hyperfine splittings and isotope shifts of (6<i>s<\/i>)<sup>2<\/sup><sup>1<\/sup><i>S<\/i><sub>0<\/sub>\u2002\u2192\u2002(6<i>s<\/i>6<i>p<\/i>) <sup>1<\/sup><i>P<\/i><sub>1<\/sub> transition in barium"],"prefix":"10.1139","volume":"73","author":[{"given":"W. A. van","family":"Wijngaarden","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J.","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"155","container-title":["Canadian Journal of Physics"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/cdnsciencepub.com\/doi\/pdf\/10.1139\/p95-069","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,7,2]],"date-time":"2025-07-02T19:29:52Z","timestamp":1751484592000},"score":1,"resource":{"primary":{"URL":"https:\/\/cdnsciencepub.com\/doi\/10.1139\/p95-069"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1995,7,1]]},"references-count":0,"journal-issue":{"issue":"7-8","published-print":{"date-parts":[[1995,7,1]]}},"alternative-id":["10.1139\/p95-069"],"URL":"https:\/\/doi.org\/10.1139\/p95-069","relation":{},"ISSN":["0008-4204","1208-6045"],"issn-type":[{"value":"0008-4204","type":"print"},{"value":"1208-6045","type":"electronic"}],"subject":[],"published":{"date-parts":[[1995,7,1]]}}}