Surface investigations on HgBr2 single crystals by using confocal scanninglaser microscopy

A confocal scanning later microscope operating at 514 and 488 nm has been u sed to obtain two-dimensional (2-D) images of the: mercuric bromide (HgBr2) crystal surface by photoluminescence, reflection, and transmission phenome na. Our measurements indicate that regions showing a strong photoluminescen ce may appear on the surface. By processing the 2-D images, we obtained the three-dimensional images, which offer a better possibility for the investi gation. The analysis of spectral lines may be correlated with the presence of the Hg impurities.