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- W2144564765 abstract "The wave numbers of the lines in a spectrum which form any of the recognised series can be calculated, as is well known, from an expression of the form n = N/D 1 2 — N/D m 2 , where N = 109675 and D m = m + fraction, the fraction being in general a function of the integer m . The constant doublet or triplet separations of S and D series are formed by the deduction of a quantity Δ, or Δ 1 , Δ 2 , in the case of triplets, from D 1 , and it has long been known that these quantities are very roughly proportional to the squares of the atomic weights when elements in the same group are compared. The present communication deals with the actual relation between Δ and the atomic weight, and with the part it plays in the general constitution of spectra. It is shown that there is a definite quantity in connection with each element which is of fundamental importance in the building up of its spectrum. It is proportional to the square of the atomic weight: in fact, if w denote the atomic weight divided by 100 its value is (90·4725 ± 0·013) w 3 . This quantity is of such universal application that it is useful to have a special name for it, and it has been called the oun ( wv ). Its value is denoted by δ 1 , but δ is used for the multiple 4δ 1 , as it is of very frequent occurrence. The evidence for its existence is based on the arc spectra of He, the elements of the Groups I and II, the Al sub-group and Sc of III and the O, S, Se of VI of the Periodic Table—in other words, all those elements in which the series lines have been allocated. It is found:— (1) That the Δ which give the doublet and triplet separations are all multiples of their respective ouns." @default.
- W2144564765 created "2016-06-24" @default.
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- W2144564765 date "1913-08-19" @default.
- W2144564765 modified "2023-09-26" @default.
- W2144564765 title "A critical study of spectral series. Part III.—The atomic weight term and its import in the constitution of spectra" @default.
- W2144564765 doi "https://doi.org/10.1098/rspa.1913.0069" @default.
- W2144564765 hasPublicationYear "1913" @default.
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