Absolute transition probabilities for the a(6)D->y(6)P degrees multiplet (#8) of Fe-II

We report the first laboratory measurement of absorption oscillator strengths (f-values) for 6 VUV (lambda(vac) similar to 162 nm) transitions of the a(6)D --> y(6)P degrees multiplet (#8) in Fe II. We have also reconfirmed a recent measurement of the f-value of the Fe II resonance line at lambda(vac) = 160.845 nm. These measurements are made with the high sensitivity absorption experiment at the University of Wisconsin-Madison. Measurements are also made on UV (lambda(air) greater than or equal to 200 nm) lines in Fe II with accurately known f-values in order to construct a reliable curve of growth for the experiment. Diffusive cooling of Fe+ ions in the negative glow of the hollow cathode discharge, which serves as an absorbing sample, results in a non-Maxwellian ion velocity distribution. A satisfactory curve of growth is generated using a full Voigt profile with an artificially low ion temperature in some cases.