Radiative decay from the2P23and2P03levels of heliumlike argon

Abstract

The allowed electric dipole transitions $2{}_{}{}^3{}_{}{}^{}P_2^{}{}_{}{}^{}-2\mathrm{}{}_{}{}^3{}_{}{}^{}S_1^{}{}_{}{}^{}$ and $2{}_{}{}^3{}_{}{}^{}P_0^{}{}_{}{}^{}-2\mathrm{}{}_{}{}^3{}_{}{}^{}S_1^{}{}_{}{}^{}$ in heliumlike argon (${\mathrm{Ar}}^{+16\mathrm{}}$) have been observed in a foil-excited beam with a vacuum-ultraviolet monochromator. The wavelengths of these transitions were measured, and the lifetimes of the excited states determined by a time-of-flight technique. The results are $\lambda (2\mathrm{}{}_{}{}^3{}_{}{}^{}P_2^{}{}_{}{}^{}-2\mathrm{}{}_{}{}^3{}_{}{}^{}S_1^{}{}_{}{}^{})=560.2\mathrm{}\pm 0.9$ Å, $\lambda (2\mathrm{}{}_{}{}^3{}_{}{}^{}P_0^{}{}_{}{}^{}-2\mathrm{}{}_{}{}^3{}_{}{}^{}S_1^{}{}_{}{}^{})=660.7\mathrm{}\pm 1.1$ Å, $\tau \left(2\mathrm{}{}_{}{}^3{}_{}{}^{}P_2^{}{}_{}{}^{}\right)=1.62\mathrm{}\pm 0.08\times {10}^{-9\mathrm{}}$ sec, and $\tau \left(2\mathrm{}{}_{}{}^3{}_{}{}^{}P_0^{}{}_{}{}^{}\right)=4.87\mathrm{}\pm 0.44\times {10}^{-9\mathrm{}}$ sec.