{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"36f0f242e6adbf25aa4941b0dfe606a6661ee097c78cd10f04ba149f2aec1c76","created":"2026-10-03T07:17:54Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","7f8c80c204c6cf27eb6664ebec25e5184988c4bca7c9aed301b692deb720f23f"],"salt":"a97f74c1596b9aa0a527d907f53b699900806d02cf1bc1686f26d4ca8f31a551","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"amo.ultracold-molecules.complex-lifetime","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"7f8c80c204c6cf27eb6664ebec25e5184988c4bca7c9aed301b692deb720f23f","relation":"special_case"}],"plain":"When two molecules stick, the lifetime of the pair depends on how many internal states it can explore. Calculations of this count disagree with some measurements.","posed_since":"","precise":"For $(\\mathrm{NaK})_2$, $(\\mathrm{RbCs})_2$ and $\\mathrm{KRb} + \\mathrm{KRb}$, compute the sticking lifetime $\\tau = 2 \\pi \\hbar \\rho / N_o$, with $\\rho$ the density of states of the complex at threshold including conserved total angular momentum, parity and nuclear spin, and $N_o$ the number of open channels. Answer: $\\tau$ for each system within a factor 2 of measured values, or a quantified failure of statistical theory.","problem_ref":null,"references":"","settled_by":"Ab initio density-of-states calculations compared with direct complex-lifetime measurements in light-free traps.","status_note":"","title":"First-principles lifetime of the four-atom collision complex","topic_ref":"1fb1ed324ce6795edc9bd20f140c48402fb8e9474fb20636a6be3feb50ae65e2"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"1d4c5e6b78a4d447f60dd6a19df37db97a9cbabaf0defb6b47bd35952c2301e9","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"40b4c8841cef87e318749e6b399268cf8ca56d7df01497d6d00472ff3820df13","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"mBXsPfejLPqwfPFKcjyaFUIAs9zPx-2dBeUjhxfSkRMjSTIsrE7O9hg3n0t05dVgTqgRfGWCHCRrGcdovGI7CA"},"schema":"pubphys.envelope/1"},"record_hash":"1d4c5e6b78a4d447f60dd6a19df37db97a9cbabaf0defb6b47bd35952c2301e9","leaf_index":468}