$\frac{K\beta }{K\alpha }$ x-ray transition-probability ratios for 16 elements in the range $18\le Z\le 39$ were measured with a high-resolution Si(Li) detector. The $K$ vacancies were produced by a heavily filtered bremsstrahlung beam from a commercial x-ray tube. Our results agree qualitatively with the theoretical calculations of Scofield but are consistently about 15% higher.

• Received 27 September 1971

DOI:https://doi.org/10.1103/PhysRevA.5.1581