On the constitution of atoms and moleculesNote 31 — PART II.—SYSTEMS CONTAINING ONLY A SINGLE NUCLEUS [23] [24].Reading editionJ. Franck u. G. Hertz, Verh. d. Deutsch. Phys. Ges. xv. p. 34 (1913).◇Copy noteReturn to PART II.—SYSTEMS CONTAINING ONLY A SINGLE NUCLEUS [23] [24].