On the Structure of the X-Ray Non-diagram Lines Kβη for Elements from Cr(24) to Zn(30)

With a bent crystal X-ray spectrograph of the Cauchois type, the nondiagram line K β η was resolved into two components and the longer wavelength one was designated as K β l line. The intensity ratios of the K β η and K β l to the K α 1 line were both estimated approximately to be the order of 10 -4 or less. On the basis of the wave-length positions, we could ascribe the origin of these lines to the two-electron jump between the double-hole levels (1 s 2 p ) and (2 s 3 s ). The hypothesis of such a two-electron jump which obeys the Heisenberg selection rule was first proposed by one of the present authors. 3) The K β η originates from the transition K L II – L I M I , and K β l from K L III – L I M I .