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The transition state H\u2013Cl bond is stretched by \u0394r = 0.40 to 2.82 bohr, significantly shorter than those for HCl on Au(111) and Ag(111). This places HCl\/Pt(111) in a distinct central barrier regime, leading to two atypical outcomes. First, unlike on Au(111) or Ag(111), where the top site is two orders of magnitude less reactive, the dissociation probability at the top site on Pt(111) is comparable to that at other sites. Second, translational energy is consistently more effective than vibrational excitation, with vibrational efficacy \u03b7 &amp;lt; 1 for v = 1 and 2 across the entire total energy range. In contrast, rotational effects remain unaffected, showing the same helicopter preference and reduced rotational efficacy as on monometallic surfaces. By comparing eleven HCl + metal systems, we reveal a clear quantitative trend. When \u0394r is 0.40\u20130.50 bohr, \u03b7 remains below unity. When \u0394r reaches 1.32 bohr, \u03b7 is always above unity. This provides a geometric rationalization of Polanyi\u2019s early\/late dichotomy.<\/jats:p>","DOI":"10.1063\/5.0340965","type":"journal-article","created":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T11:02:59Z","timestamp":1784026979000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":1,"title":["Central-barrier dynamics in HCl dissociative chemisorption on Pt(111): Transition state bond elongation as a geometric indicator of vibrational efficacy"],"prefix":"10.1063","volume":"165","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6011-9263","authenticated-orcid":false,"given":"Tianhui","family":"Liu","sequence":"first","affiliation":[{"name":"School of Sciences, Great Bay University 1 , Dongguan 523000,","place":["China"]},{"name":"State Key Laboratory of Chemical Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences 2 , Dalian 116023,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1568-0259","authenticated-orcid":false,"given":"Bina","family":"Fu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences 2 , Dalian 116023,","place":["China"]},{"name":"University of Chinese Academy of Sciences 3 , Beijing 100049,","place":["China"]},{"name":"Hefei National Laboratory 4 , Hefei 230088,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9426-8822","authenticated-orcid":false,"given":"Dong H.","family":"Zhang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Chemical Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences 2 , Dalian 116023,","place":["China"]},{"name":"University of Chinese Academy of Sciences 3 , Beijing 100049,","place":["China"]},{"name":"Hefei National Laboratory 4 , Hefei 230088,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2026,7,14]]},"reference":[{"key":"2026071407025334700_c1","doi-asserted-by":"publisher","first-page":"1904","DOI":"10.1103\/physrevlett.55.1904","volume":"55","year":"1985","journal-title":"Phys. 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