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Ionisation and excitation populates the He$^{+}$ 4$p$ state. Strong, directional emission was observed at wavelengths of 469 nm, 164 nm, 30.4 nm, and 24.5 nm. We interpret the emissions at 469 nm and 164 nm as 4$p$-3$s$-2$p$ cascade superfluorescence, that at 30.4 nm as yoked superfluorescence on the 2$p$-1$s$ transition, and that at 25.6 nm as free-induction decay of the 3$p$ state."},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1809.06503","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2018-09-18T02:13:36Z","cross_cats_sorted":[],"title_canon_sha256":"a5c38f67c2ab4a63e850cc43097c274dc58152ebba2e43c829da43c27cb42a83","abstract_canon_sha256":"7ec3dfe06b587b9d34900c3588885d90251d84317da3564b30eebf9064343318"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:57:19.204895Z","signature_b64":"Puxcly8OJXefa+KUfhmDWw8t25GwkTVoggefENErrnZDHdNheHMvtGA+tR47Vyu5JTn2quZ8xAsWKHTYzF5XDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"abf875f408f752b043404a70464c3001e73d158577fc0329b493dffb69bd44e8","last_reissued_at":"2026-05-17T23:57:19.204411Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:57:19.204411Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Superfluorescence, free-induction decay, and four-wave mixing: propagation of free-electron laser pulses through a dense sample of helium ions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"Eiji Shigemasa, Hiroshi Iwayama, Ichiro Inoue, James R Harries, Kensuke Tono, Makina Yabashi, Masatomi Iizawa, Norihiro Suzuki, Shigeki Ohwada, Susumu Kuma, Tadashi Togashi, Yoshiro Azuma","submitted_at":"2018-09-18T02:13:36Z","abstract_excerpt":"We report an experimental and numerical study of the propagation of free-electron laser pulses (wavelength 24.3 nm) through helium gas. 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