Accurate Lifetimes and Absolute Transition Rates for Ultraviolet Transitions from 3 d 5 ( 4 G ) 4 p and 3 d 5 ( 4 P ) 4 p levels in Mn ii

A recently developed, laser-induced fluorescence technique was used to measure the lifetimes of 14 3 d 5 ( 4 G )4 p and 3 d 5 ( 4 P )4 p levels in the Mn + ion. Branching fractions for electric dipole transitions from these levels were measured with a vacuum ultraviolet Fourier transform spectrometer, using a hollow-cathode lamp and a Penning discharge source. Based on these new measurements, absolute electric dipole transition rates for about 170 spectral lines in the ultraviolet and vacuum ultraviolet were determined. The uncertainty of the transition rates is less than 5% for the strong transitions.