{"paper":{"title":"Radiative lifetime of the $a\\ ^3\\Sigma^+$ state of HeH$^+$ from ab initio calculations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"J.Li\\'evin, J. Loreau, N.Vaeck","submitted_at":"2010-06-03T08:44:36Z","abstract_excerpt":"The first metastable triplet state of HeH$^+$ was found to be present in ion beam experiments, with its lifetime estimated to be between hundreds of milliseconds and thousand of seconds. In this work, we use {\\it ab initio} methods to evaluate the radiative lifetimes of the six vibrational levels of the $a\\ ^3\\Sigma^+$ of HeH$^+$. The transition $a\\ ^3\\Sigma^+ \\rightarrow X \\ ^1\\Sigma^+$ is spin-forbidden, but acquires intensity through spin-orbit interaction with the singlet and triplet $\\Pi$ states. Large scale CASSCF/MRCI calculations using an adapted basis set were performed to determine t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1006.0592","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}