Measurement of atomic L shell Coster-Kronig yields (f(12), f(23) and f(13)) for some elements in the atomic number range 59 <= Z <= 90

Non-radiative transitions cause changes in the generation of the intensity of the L lines. In order to investigate the physical quantities relevant to the L lines affected by the non-radiative transitions, experimental measur ements were carried out using a Si(Li) x-ray spectrometer. Atomic L shell C oster-Kronig yields (f(12), f(13) and f(23)) for some elements in the atomi c number range 59 less than or equal to Z less than or equal to 90 were det ermined. These selected measured semi-empirical values were also fitted by least squares to polynomials in Z of the form Sigma (n) a(n) Z(n) (except f or f(13)) and compared with theoretical and with earlier fitted values.