The Series Spectra of the Stripped Atoms of PhosPhorus (PV), Sulphur (SVI), and Chlorine (ClVII)

Abstract

Spectra of stripped atoms, sodium to chlorine.—Grating spectrograms of order three to eight have been obtained of the hot-spark spectra of these elements, which have yielded more accurate values for the ($3p_2-3\mathrm{}{p}_1$), ($3s-3p_2$) and ($3p_1-3d$) terms of ${\mathrm{Al}}_{\mathrm{III}}$, ${\mathrm{Si}}_{\mathrm{IV}}$, ${\mathrm{P}}_{\mathrm{V}}$ and ${\mathrm{S}}_{\mathrm{VI}}$, and have enabled the identification and determination within about 5 frequency units (1) of 18 series lines of ${\mathrm{P}}_{\mathrm{V}}$, and thence of the 14 most important term values ($3s \mathrm{to} 6f^{\prime \prime }$), (2) of 11 series lines of ${\mathrm{S}}_{\mathrm{VI}}$, and 10 corresponding term values ($3s \mathrm{to} 5f^{\prime }$), and (3) of the first doublet of the principal series of ${\mathrm{Cl}}_{\mathrm{VII}}$ at 800.70 and 813.00 A. The position of this doublet was first predicted by use of the method developed in a previous ${\mathrm{paper}}^1$, based on observed regularities in these spectra. Further evidence is presented for the fact that both the regular and the irregular doublet laws of x-ray spectra, hold also throughout the field of optics. A plot of $\sqrt{\frac{\nu }{R}}$ for the stripped atom levels as a function of atomic number gives approximately straight lines (Moseley law), those for the $3s$, $3p$ and $3d$ terms and for the $4s$, $4p$, $4d$ and $4f$ terms being approximately parallel (irregular doublet law). The doublet separations $d_1{d}_2$, however, do not fit well into the relativity doublet law, the ratio of observed to theoretical values decreasing from about.8 for ${\mathrm{S}}_{\mathrm{VI}}$ to less than.2 for ${\mathrm{Si}}_{\mathrm{IV}}$, while ${\mathrm{Al}}_{\mathrm{III}}$ and ${\mathrm{Mg}}_{\mathrm{II}}$ are anomalous, $d_1$ having a greater frequency than

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This publication has 4 references indexed in Scilit:

• The Extension of the X-ray-Doublet Laws into the Field of Optics
  Physical Review B, 1924
• The Series Spectra of the Stripped Boron Atom (BIII)
  Proceedings of the National Academy of Sciences, 1924
• The series spectrum of trebly-ionised silicon (Si IV)
  Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 1923
• Die Funkenspektren des Aluminium. I. Teil
  Annalen der Physik, 1923

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