{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"e8722f6a3e548dcf4905de1f915a44be92ef48f27e22fc17e16c78b82a10e150","created":"2026-10-03T07:18:08Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"1c769ef47bfe2ba38d6b722b68e4c6f0aeae1261bbb1d135b6158ad0c73be7f9","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"plasma.warm-dense-matter.electron-ion-relaxation","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"When electrons are heated first, as by a laser, they take time to share energy with the heavy ions. In warm dense matter different theories disagree by large factors on how long that takes.","posed_since":"","precise":"For hydrogen and carbon at density 1 to 100 $\\mathrm{g}/\\mathrm{cm}^3$ and temperature 1 to 100 eV, where the ion coupling parameter is near 1 and the electron degeneracy parameter $T/E_{F}$ is near 1, determine the electron-ion energy exchange rate relative to the Landau-Spitzer value. Quantum kinetic theories, coupled-mode treatments and ab initio molecular dynamics differ by up to several times. An answer is a measured rate with 20 percent precision compared with theory.","problem_ref":null,"references":"","settled_by":"Time-resolved X-ray scattering measurements of $T_{\\mathrm{e}}$ and $T_{\\mathrm{i}}$ relaxation in isochorically heated samples, matched by one theory.","status_note":"","title":"Electron-ion temperature relaxation rate in warm dense matter","topic_ref":"7b89d006c6b826eefaa6dd12fe5a55f76897cd2410bf60673fc30e5084ab9054"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"f601cfcbc689ff6e49892f2cca1b41c2e7a42a5a9a7af19527f51d7826e1f7b1","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"1a1e1cd6cc091221d06aa6fce8a380f32860bf59b0ee5120cfb847c868ffbfcd","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"HsN3ekV27M8w0YOZVQcHrVz6Wv9yRBxKHby8vci9dNEx6b1bT-2gWNnlqm_WhV_t_eKK7EBSLvKFpacienJ-BA"},"schema":"pubphys.envelope/1"},"record_hash":"f601cfcbc689ff6e49892f2cca1b41c2e7a42a5a9a7af19527f51d7826e1f7b1","leaf_index":1887}