Eg versus x relation from photoluminescence and electron microprobe investigations in p-type Hg1−xCdxTe (0.35 ⩽ x ⩽ 0.7)

Combined photoluminescence (at 10 ⩽ T ⩽ 300 K) and electron microprobe investigations have been carried out with HgCdTe samples grown from the melt or from solution. By exciting the samples through metallic masks with 200 μm diameter holes fixed with respect to the sample care was taken to pick-up both characteristic X-ray radiation as well as the photoluminescence from the same sample area. The E g versus x relation determined in this way at T = 30 K has been compared with data from the interband absorption edge by other authors.