Certain Spectra in the Vanadium I Iso-Electronic Sequence

Abstract

Displacement of multiplets in the iso-electronic sequence which begins with the arc spectrum of vanadium.—Regular displacements were observed for analogous quartets and sextets in the spectra of Mn III, Fe IV, Co V and Ni VI, continuing those already known for V I and Cr II. In addition a new sextet sequence has been found for V I to Co V. The configuration changes investigated were $3d^4 4p$ to $3d^4 4s$, $3d^4 4d \mathrm{to} 3d^4 4p$, $3d^4 4p \mathrm{to} 3d^5$ and $3d^3 4sp \mathrm{to} 3d^3 4s^2$.