Wave-lengths and comparative positions of certain multiplets in the spectra of ${\mathbf{Ca}}_{\mathrm{I}}$, ${\mathbf{Sc}}_{\mathrm{II}}$, ${\mathbf{Ti}}_{\mathrm{III}}$, ${\mathbf{V}}_{\mathrm{IV}}$, ${\mathbf{Cr}}_{\mathrm{V}}$.—When an electron in a $4p$ orbit jumps to a $4s$ orbit in the presence of another valence electron in a $3d$ orbit, multiplets of the type ${}_{}{}^3{}_{}{}^{}D_{1,2,3}^{}{}_{}{}^{}-{}_{}{}^3{}_{}{}^{}P_{0,1,2}^{}{}_{}{}^{}$; ${}_{}{}^3{}_{}{}^{}D_{1,2,3}^{}{}_{}{}^{}-{}_{}{}^3{}_{}{}^{}{D}^{\prime }_{1,2,3}^{}{}_{}{}^{}$; ${}_{}{}^3{}_{}{}^{}D_{1,2,3}^{}{}_{}{}^{}-{}_{}{}^3{}_{}{}^{}F_{2,3,4}^{}{}_{}{}^{}$ appear. These multiplets for ${\mathrm{Ca}}_{\mathrm{I}}$, ${\mathrm{Sc}}_{\mathrm{II}}$, ${\mathrm{Ti}}_{\mathrm{III}}$ have already been recognized by other investigators. The same multiplets for ${\mathrm{V}}_{\mathrm{IV}}$ and ${\mathrm{Cr}}_{\mathrm{V}}$ have now been found and the wave-lengths of the lines have been measured. The progressive shift in the relative positions of these multiplets in passing from element to element has been noted. The regular and irregular doublet laws have been found to hold fairly accurately for two electron systems when one of the electrons jumps between two orbits, $p$ and $s$, having the same total quantum number.

Close

PrevNext

View figure in article