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One of these sources, IRAS 21282+5050, a planetary nebula, also exhibits a weak band at ~1.68 $\\mu$m. While the satellite features at ~3.4-3.6 $\\mu$m are often attributed to the anharmonicities of PAHs, it is not clear whether overtones or combination bands dominate the 1.68 $\\mu$m feature.\n  Aims. In this work, we examine the anharmonic spectra of eight PAH molecules,"},"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":"1910.07062","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-10-15T21:36:00Z","cross_cats_sorted":["physics.chem-ph"],"title_canon_sha256":"f49ffd1db557df9ced235404828844473f80c1da09cbff0ffe15a14b7a377470","abstract_canon_sha256":"52792e6669ce4228eabcbf3c7243be849adaf3bbc133b4e964e8f34e7c8661f9"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:23:45.426578Z","signature_b64":"kKEMEKS8iUdAQhmmynuYBQHxK3uoBs8QMeSCvPcx3x+sysK/xymaKcIByqjj1iwdt4uUD13gaQOi1QQnZ9pwAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6b2189bd3d54de08c98181dd7c3d430082572cb221748408ba6131af60dc51f2","last_reissued_at":"2026-07-05T00:23:45.426115Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:23:45.426115Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The infrared bands of polycyclic aromatic hydrocarbons in the 1.6-1.7 {\\mu}m wavelength region","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.chem-ph"],"primary_cat":"astro-ph.IM","authors_text":"Aigen Li, Tao Chen, Yi Luo","submitted_at":"2019-10-15T21:36:00Z","abstract_excerpt":"Context. 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