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2026-10-09 Bayerische Akademie der Wissenschaften publication server (publikationen.badw.de)

Found through Google query "Sommerfeld Briefwechsel online Paschen Feinstruktur 1915 Deutsches Museum Sommerfeld-Projekt". Accessed by script.

  • Sommerfeld, "Die Feinstruktur der Wasserstoff- und der Wasserstoff-ähnlichen Linien", Sitzungsberichte der Bayerischen Akademie, 1915, Heft 21 (presented 4 Dec 1915; p.425 per Paschen 1916 and Glitscher 1917), https://publikationen.badw.de/de/003395523, PDF CC BY, 9 MB [web]. Saved: files/Sommerfeld-1915-Feinstruktur-SitzberBayAkad-badw003395523.pdf (not yet read; the scan may have no text layer).
  • This is the first public statement of the fine-structure theory, a month before the Paschen letters of Dec 1915 and before the Annalen treatise. Priority 1 (inventor's own work). It lets a reviewer see the theory as first proposed, including the uncertain factor Eckert (EPJH 2014) says Sommerfeld fixed only "from hindsight in an appendix".
  • A companion memoir of 8 Jan 1916 (Sitzungsber. p.459, cited by Paschen 1916; title not checked) was not searched; INIS lists both treatises ("December 6th 1915 and January 8th 1916 ... 75 printed pages") in a 2013 record "The Bohr-Sommerfeld atom theory. Sommerfeld's extension of ..." (https://inis.iaea.org/records/23n7y-9rk93), which was blocked by a Cloudflare check (scripted fetch).

Not reached: the BAdW search for other Sommerfeld Sitzungsberichte (1916 Jan; 1917 on the Stark effect).