Study of luminescent materials by electron beam microscope - involves spectroscope with slit adjustable in height and width

摘要

Luminescent materials are studied by the observation of the light emitted when they are excited by an electron beam. A spectroscope is inserted between the sample and the photomultiplier tube and is operated to obtain optimum quality of image for the wavebands of interest. A sample (E) is set at an angle such that the telescope (10) receives the maximum energy from the source. A cylindrical light beam of reduced cross section is obtained at the output doublet (13). This beam is directed onto a dispersive glass prism (21) with minimum deviation for the sodium D radiation and then onto an achromatic condenser (31, 32). A slit (41) with adjustable level and opening selects the spectral region and intensity for the photomultiplier (PM).