Certain Multiplets in the Spectra of Cadmium III and Indium IV

Abstract

Terms and related wave-lengths and frequencies arising from the configuration d l \ d*s, d 9 p of Cd III and In IV.-Guided by the transitions from *PDF, l PDF, (4=d 9 5p) to Z D, l D (4:d d 5s) already determined for Pd I and Ag II the corresponding lines have been identified in the spectra of Cd III and In IV. The transitions from a D u 3 P X and 1 Pi(4:d 9 5p) to ^o^d 10 ) the latter being the lowest level in each of these spectra, have also been identified for Ag II, Cd III and In IV. These combinations account for nearly all of the strong lines in each spectrum. The term values for the four iso-electronic systems Pd I, Ag II, Cd III, and In IV, together with those for the corresponding elements in the first long period have been plotted on a Moseley diagram which brings out certain similarities and variations between these two sets of spectra.

EUV photoabsorption spectra of Cd II and Cd III

“…The 4d 9 5s np, mf series converge to the 4d 9 5s 3 D 3 , 3 D 2 , 3 D 1 and 1 D 2 terms of Cd III. These lie 9.999 eV, 10.212 eV, 10.691 eV and 11.020 eV above the ground level of Cd III (Gibbs and White 1928). The ionization limit of Cd II has been determined as 16.908 eV (Shenstone and Pittenger 1949), so that the series limits lie 26.907 eV, 27.120 eV, 27.599 eV and 27.928 eV above the ground state of Cd II.…”

Term analyses of the first two spectra of columbium

“…Cb spark lines definit~ly identified as belonging to Cb III [15] and Cb Iv [16] spectra are omitted, and also about 60 lines not observed in the arc and appearing very hazy (H) in the spark. The latter could not be classified as Ob II and some of them may belong to Ob III.…”

4d photoabsorption spectra of Indium (In II–In IV)

“…The atomic structure of indium and its ions has received much interest both from a spectroscopic point of view and in industrial applications. Previous spectrosopic studies along the indium isonuclear sequence include photoabsorption in In I [1], optical emission [2] and photoabsorption [3] in In II and emission in In III [4][5][6] and In IV [7,8]. Analysis of the Ag I isoelectronic sequence [9] and the Pd I isoelectronic sequence [10] suggested strong configuration interaction was present in In III and In IV.…”

“…Gibbs and White [6] recorded the spectrum of triply ionized indium in the range 472-1725 Å and identified the following transitions 4d 9 5p → 4d 9 5s and 4d 9 5p → 4d 10 . Nodwell [4] measured these levels more accurately from spectra obtained on a 2 m grazingincidence spectrograph.…”