Beam-Foil Lifetime Measurements in C III, N III, N IV and O III

Abstract

Using the beam-foil technique with emphasis on high wavelength resolution in VUV region, radiative lifetimes have been measured for some excited levels in C, N and O ions. The line at 764.36 Å due to 2s 2 2p 2 P 3/2 -2s2p 2 2 S 1/2 transition in N III was clearly resolved from a nearby lying line of N IV. Some of the irregularity existing in the systematic trend of oscillator strength along the isoelectronic sequence have been removed.