Measurement of L x-ray emission from elements in 64 ≤ Z ≤ 73 interval stimulated by 59.54 keV photons

Accurate measurements (mostly within 5%) of L?, L? and L? x-ray emission cross sections were carried out on thick foils of elements lying in 64 ? Z ? 73 interval, stimulated by 59.54 keV photons. They can be of help as an overall reference to compare the theoretical and semi-empirical approaches by which the atomic parameters included in the expressions of L emission cross sections are evaluated. An appropriate extension of the expression linking the cross section to the counting rate measured in reflection geometry on thick targets makes it possible to overcome the difficulties arising from the width in energy of the L? and L? groups and from the jump present in the attenuation coefficients of the target elements within the energy interval of their L? emission lines.