Oscillator Strengths of Neutral Atoms of the Iron-Group

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Abstract
Measurements from various sources of the relative oscillator strengths of multiplets in Sc, Ti, V, Cr, Mn, Fe, Co, Ni have all been reduced to a consistent absolute scale. This makes it possible to compare experimental accuracy, make certain corrections, and tabulate mean measurements. The measurements are then compared with calculations based mainly on an elaboration of the ƒ -sum rule. The character of the results differs for three sets of multiplets as follows:— ( a ) For the transition types A, E, F, G, H, which involve non-equivalent electrons only, the log (observed/calculated) intensity is almost independent of excitation potential or wave-length. The scatter is probably due to unsuitability of the designations or to the interaction of terms. When absolute ƒ -value measurements (for Cr, Mn, Fe, Co, Ni only) are used to convert these multiplets to a measured absolute scale, all atoms are within a factor 3 of the calculated scale. The high (obs./calc.) value in Mn is discussed. There is only a small systematic difference between observation and calculation. ( b ) For the transition types B, C, which involve equivalent electrons, the scatter of the results is much larger. Multiplets with an upper excitation potential less than 4 eV have ƒ -values below the calculations, while above 4 eV values agree with the calculated absolute scale. ( c ) Measured values of multiplets violating LS -coupling vary erratically between zero and an empirically calculated value. Recommended corrections for putting the mean values onto the best absolute scale are given.

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