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Accurate positions of the FeII lines 1608, 2382,and 2600 A are measured in the z = 1.84 absorption system from a high-resolution (FWHM = 3.8 km/s) and high signal-to-noise (S/N >= 100) spectrum of the quasar Q1101-264 (z_em = 2.15, V = 16.0), integrated for 15.4 hours. The Single Ion Differential alpha Measurement (SIDAM) procedure and the Delta chi^2 method are used to set constraints on Delta alpha/alpha. We have found a relative radial velocity shift between the 1608 A and 2382,2600 A lines of Delta v = -180 +/-"},"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":"astro-ph/0703042","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-03-02T09:30:59Z","cross_cats_sorted":[],"title_canon_sha256":"dd1c71fd46bb9135dccc376f690d2f3a1d6ecb51721be2c83ecefab7e2954367","abstract_canon_sha256":"3e28ccd4155527ef5e55605bf6086b9b91fae545e149b9bb452cadbfa89da7df"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T17:07:44.016071Z","signature_b64":"L5qPR7btgHTe8tShuQida8Roy4mRXwndGjBdoVcAA7h/EI+YLeRUA9dEJ881FNMKxC+XQyHvNUQHPSMjdfM6Dg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"61d972ca5d33514d00ad194b920e6eed2b9396c951eb54e85a5464b4b23a5e62","last_reissued_at":"2026-07-04T17:07:44.015726Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T17:07:44.015726Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A new measure of Delta alpha/alpha at redshift z = 1.84 from very high resolution spectra of Q1101-264","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"D. 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