Abstract
The ionometrically recorded electron excited M X-ray emission spectrum of tungsten has been reported. The gamma region of the spectrum and the line arising due to the transition 3d-13/2 to 5p-11/2 have been studied for the first time by an ionometric method. A satellite, referred to as gamma ' in the literature, has been recorded and assigned to the superposition of some of the transitions of 3p-132/4l-1 to 4l-14d-15/2 group. The line arising due to the 3d-5p transition has been observed to have a large asymmetry towards the lower energy end. The origin of this low-energy component has been discussed on the basis of an interaction between a 5p hole and an unfilled 5d subshell. The possible hypersatellites which fall in this region of the spectrum and which could account for the structure of this line have also been indicated.
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