RADIATIVE LIFETIMES, BRANCHING RATIOS, AND ABSOLUTE TRANSITION-PROBABILITIES IN CR-II AND ZN-II

New absolute atomic transition probability measurements are reported f or 12 transitions in Cr ii and two transitions in Zn II. These transit ion probabilities are determined by combining branching ratios measure d by classical techniques and radiative lifetimes measured by time-res olved laser-induced fluorescence. The measurements are compared with b ranching fractions, radiative lifetimes, and transition probabilities in the literature. The 206 nm resonance multiplets in Cr II and Zn II are included in this work. These multiplets are very useful in determi ning the distribution of the elements in the gas versus grain phases i n the interstellar medium.