The Natural Widths of theL-Series Lines in the X-Ray Spectra of Elements 74 to 83

Abstract

The full widths at half-maximum of the $L{\alpha }_1$, $L{\beta }_1$, $L{\beta }_2$ and $L{\gamma }_1$ lines of Bi, Pb, Tl, Au, Pt, Ir and W have been measured with Allison's double spectrometer in the (1, +1) position equipped with previously calibrated calcite crystals of high perfection. The results in X.U. are given in the table. The widths are uncorrected for the finite resolving power of the crystals or for the geometrical divergence of the x-ray beam. Approximate small corrections have been made for interfering lines. Relative wave-lengths of neighboring lines are given. Empirical relations between the energy widths of the lines investigated and the atomic number and the electron transitions involved are suggested. The effects of alloys of the elements on the widths observed are discussed.